The Gravity of the Situation: Crash Course Astronomy #7

Подписаться 16 млн

Просмотров 1,5 млн

50% 1

In today's episode, Phil looks at how gravity plays out across the universe.
This episode is sponsored by Squarespace: www.squarespace.com/crashcourse
Check out the Crash Course Astronomy solar system poster here: store.dftba.com/products/crash...
--
Chapters:
Introduction 00:00
Understanding Mass 1:11
What is Gravity? 2:17
Different Types of Orbit 3:41
Escape Velocity 5:30
Why Are Astronauts Weightless? 7:03
Gravity Warps Space 8:17
Review 8:43
--
PBS Digital Studios: / pbsdigitalstudios
Follow Phil on Twitter: / badastronomer
Crash Course is on Patreon! You can support us directly by signing up at / crashcourse
Want to find Crash Course elsewhere on the internet?
Facebook - / youtubecrashcourse
Twitter - / thecrashcourse
Instagram - / thecrashcourse
CC Kids: / crashcoursekids
--
PHOTO/VIDEO CREDITS
First photo by Roscosmos / NTSOMZ/ SRC "Planeta" / zelenyikot.livejournal.com
www.slate.com/blogs/bad_astron...
commons.wikimedia.org/wiki/Fil...
en.wikipedia.org/wiki/Isaac_Ne...
en.wikipedia.org/wiki/Johannes...
en.wikipedia.org/wiki/Karen_L....
• Departing Space Statio...

Опубликовано:

8 авг 2024

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 1,2 тыс.

@Pyrex92 9 лет назад

If I was a science teacher, I would feel compelled to show each of these videos for 10 minutes per class. They're amazing

@KhanPiesseONE 9 лет назад

they do in australia

@Fr0st1s 9 лет назад

Khan Piesse You guys are so lucky!

@KhanPiesseONE 9 лет назад

Fr0st1s Well, I thought that was normal, they put up Science, History, Math or English videos from the State Governments eLearn systems, or RU-vid, go through it with us, then we do the normal school stuff like typing our assignments and notes and points and study guides on our laptops, that data helps us complete our course assignments for each semester, the data is imputed to the National OneSchool system which pretty much governs all public schools in Australia, It's quite high tech when I think about it now, easier than what America and other poor people countries do.

@Fr0st1s 9 лет назад

WOW! Australian school system looks so advanced. Now to think of it, I feel like I finished school in stone age, compared to you :) Even today education system in my country looks is poor.

@KhanPiesseONE 9 лет назад

Fr0st1s What country is that?

@BriWhoSaysNi 9 лет назад

Suddenly I'm actually glad I took AP Calc because when he started talking about the rock that started at escape velocity getting slower and slower but not stopping I was like "Oh, you mean a limit?" and it made the whole concept easier to get. So much for never using it. lol

@charleslarue792 9 лет назад

If I might make a recommendation, oh fellow astronomer, I would suggest more graphics for things like the shapes of orbits and whatnot.

@megashley1963 9 лет назад

I agree. I understand everything he was talking about, but that is because I already knew this stuff. If I were unfamiliar with orbital mechanics the lack of visuals could be really confusing.

@gandalfthegrey2171 9 лет назад

my thoughts exactly

@observant6953 6 лет назад

I never understood this RU-vid thing of a video in which you only see a person talking to you. Completely ignores everything that would be possible with video.

@emmettdel 9 лет назад

You're an awesome teacher! I love how engaged you are, it makes me feel like I'm watching Bill Nye again

@moumenaabdalla8396 4 года назад

hahaha, he is my best astronmy teacher . kareem mostafa

@Woodenfan 9 лет назад

This brings me flashbacks to physics. Gotta say, I got more out of this video than an entire lecture or two of physics on gravity.

@Woodenfan 9 лет назад

I'm in college dude xD

@Woodenfan 9 лет назад

I changed to IT.

@sayuas4293 9 лет назад

This is all really basic, I was hoping for more advanced stuff.

@Woodenfan 9 лет назад

I bet he'll build upon this stuff later on :) Probably going to be a 30-40 episode series, so what I said seems plausible

@kadehernandez4619 9 лет назад

Sayuas It is, but I'm sure we'll get into the good stuff later on. Actually explaining what gravity is is more astrophysics, which I'm sure he'll get into later on.

@sonalirai3264 5 лет назад

6:17 that part was funny like “I hope you kissed your rock goodbye because it ain’t coming back” I like Phil he is funny

@IMVADER2 9 лет назад

Astronomy class was one of the few I looked forward to in high school. Classroom in a planetarium every day, watching the stars spin by while listening to Stairway to Heaven...this isn't like my class, but it's kept me as interested as I have been in that room for my high school career. Really glad I found this series from the start, and I won't be stopping until you guys do, which hopefully is in a VERY long time :)

@sindrebrve7893 9 лет назад

Can you start Crash Course: Geography Pleeeeeeeeeease I'll give you 50% of the views

@sindrebrve7893 9 лет назад

+ i did not write first so you should do it

@RBuckminsterFuller 9 лет назад

kake pynt If you're 50% of the views that means they only got 2 viewers. That's not a very good incentive. Maybe they should make a crash course math/statistics instead.

@sindrebrve7893 9 лет назад

Heard of refresh.........

@Cosmalano 9 лет назад

That would mean they would get two views.

@abeta201 9 лет назад

Haven't you ever hear of CGP Grey?

@WrathOfMega 9 лет назад

So what you're saying is; the moon is literally just falling at the Earth and missing. Weeeeird.

@Cosmalano 9 лет назад

Yes. Not weird, truth.

@WrathOfMega 9 лет назад

electrocat1 the truth can be weird.

@jonathan0225 9 лет назад

can you guys clarify how it maintains its orbit if gravity is bound to pull it in? What causes that orbiting suspension? sorry for this question, i really haven't got into science that much because of my chosen course.

@Cosmalano 9 лет назад

If you think about it in terms of general relativity, then there is just a line in space time that wraps around the Earth that the moon is following. But thinking from the way described here, the moon is falling towards the Earth. Imagine throwing a ball so far that it goes around the apparent "edge" of the Earth. You would see the ball come back around as it continued to try and fall, only to miss the Earth by the time it gets to a height where it would normally land. This perpetual falling is how the moon stays in orbit, just farther away.

@jonathan0225 9 лет назад

So then, what's keeping the moon from falling? in terms of force that is.

@darkmatter3538 9 лет назад

4:29 I IMMEDIATELY Thought of Toy Story when he said that Woody: THAT WASN'T FLYING! THAT WAS FALLING WITH STYLE!!!

@feynstein1004 6 лет назад

Me too :)

@xaniel6639 5 лет назад

are you okay?

@Manish-nj6jo 9 лет назад

Your videos are highly educational. You and the rest of the crash course team make education fun and interesting to learn. Keep it up. Don't forget to be awesome crash course.

@ScienceAsylum 9 лет назад

Hey! I uploaded a science video back in July with this same exact title! ...great minds think alike?

@feynstein1004 6 лет назад

Whoa, dude. Fancy seeing you here. :)

@rosebud1669 5 лет назад

I really wish he would do a series showing how to actually measure and calculate luminosity, distance between celestial objects, blue/red shift, etc. In simplification, it would be amazing if he had a series specifically dedicated to cosmology.

@gabrielrangel956 9 лет назад

There should be a Crash Course Maths, or rather, Crash Course Calculus, Crash Course Linear Algebra, so on. Why is it that there's no Crash Course on Maths?

@edwardmcdonagh7309 9 лет назад

i think crash course calculus would only be good for a few episode, i can't imagine a level and degree level maths making great youtube videos but id love a mathematics series

@gabrielrangel956 9 лет назад

I wouldn't expect them to delve in deep but single-variable calculus is reasonably simple. It may as well be Algebra or a particular topic of Algebra.

@danheidel 9 лет назад

Crash Course has a limited amount of resources to make videos. It's possible they'll get to math some point in the future. Khan Academy and plenty of other websites have lots of good math videos right now if you are interested in that.

@gabrielrangel956 9 лет назад

Dan Heidel I don't think it's more expensive than their usual videos. There's MIT Open Courses also, it's just a thought really.

@Emma-fn4rs 9 лет назад

That would be great! I'm not in calculus yet, so it would be great to get a head start!

@headrockbeats 9 лет назад

Easily my favorite Crash Course series so far. KEEP IT UP!

@Lee_yourboylee 9 лет назад

Great job guys, this is proving to be another wonderful CC. They enrich my life immensely. Genuinely can't thank you enough.

@annamattos8627 5 лет назад

OMG, I love that Douglas Adams definition of flying. I have been laughing with it for years and now I know why it is also cientifically accurate. Thank you!!!

@pizzael 9 лет назад

I love his explanations for things! Just when I'm about to feel like I can't wrap my head around it, he says something that will simplify it :). Go Phil!

@jonroskilly3983 9 лет назад

Best Crash Course Astronomy so far, really looking forward to the next ones!

@1994fishcake 9 лет назад

How about Crash Course Engineering (Mech,Electrical, Aero etc)?

@JacobShepley 9 лет назад

those are pretty horrendously open fields of study that cover applied science in general

@KASASpace 9 лет назад

Jacob Shepley Not per se... mechanical engineering is all about loads on structures. That and temperature. So a quick video describing how maximum loads are calculated would be nice.

@liamfris256 9 лет назад

Phyyyyyyyyyyyyyyssssssssssssssiiiiiiiiiiiics

@raiseaglass1607 9 лет назад

Crash Course Physics!

@edwardmcdonagh7309 9 лет назад

might have to be more specific, after all, everything is physics!

@raiseaglass1607 9 лет назад

Edward McDOnagh Yes, I am quite aware of that fact. However, Physics textbooks do exist. How else am I supposed to explain that?

@tenaciousdean6179 9 лет назад

McKenzie Banner This is physics. You will have to be more specific.

@sajidmahmud7945 7 лет назад

It is available now!

@aronious291 5 лет назад

why do they never discuss terminal velocity when gravity is discussed

@Numbuh1NerdX 9 лет назад

Ironically enough, I'm supposed to be writing a book report on Hitchhiker's Guide to the Galaxy right now.

@foregtablename 8 лет назад

just started watchin' this, had a lecture about gravity and black holes today and saw it is exactly a year since this video was posted. Thankyou, crashcourse, for making Astronomy videos :)

@TheDarkBrethren 9 лет назад

These episodes are amazing. Thank you so much for broadening my, and many other people's minds. Space is so fun and helps with perspective. Thank you :)

@carterwilliamson8504 9 лет назад

Looks like we're going to learn about gravitational lensing!!!! Fun

@Linkous12 9 лет назад

You'll probably discuss this in the next video, but wouldn't it be better to say that gravity *is* the warping (curvature) of space, rather than it *does* warp or curve space?

@Zerepzerreitug 9 лет назад

baby steps Matt. baby steps. Remember that many out there still struggle remembering the names of the planets.

@alucardwhitehair 9 лет назад

Arturo Gutierrez That sickens me.

@tobywilson 9 лет назад

This was my one nitpick of the video. Gravity IS the warping of space-time, is doesn't cause it. A subtle difference that doesn't make the video any more confusing to people who are struggling, but makes it correct.

@DanThePropMan 9 лет назад

Hey Phil, just wanted to say that I think you're killin' it with this host gig. Keep up the good work!

@bertwimlore7740 6 лет назад

For me, this is more informative on the topic of Astronomy than even the Cosmos series. Home. Freaking. Run. Phil, you da man.

@stenbak88 9 лет назад

I'm starting to get into astronomy, thank you for that Phil, keep on keepin on

@ruolbu 9 лет назад

soo much of your explanations about orbits could have used simple graphics imo. Seriously I don't think I could've followed without ksp.

@BillWestlakeCraft 9 лет назад

I have watched a lot of these crash course, and this is one of the best I have seen. You teach very clearly, and have a very engaging style. My hats off to you sir!

@FunkyHonkyCDXX 9 лет назад

Best episode yet. Way to take a potentially complicated subject and make it very understandable.

@drink15 9 лет назад

This video should be included in KSP.

@explosivebrickstudios2693 4 года назад

Did I seriously just watch a class?!!?? This was soo entertaining

@TheAraz95 9 лет назад

This is awesome! I loved you badastronomer channel since day one!

@blighboy1 9 лет назад

I just want to say I love these CCA videos. I'm usually unfairly cautious towards non-Hank/John presenters, but Phil is great.

@beleafer22 7 лет назад

THESE VIDEOS ARE FUCKIN AWESOME!!!!

@chichi-nm8kn 7 лет назад

Reading these comments makes me feel like I'm on the smart side of youtube. I've come along way from leeroy jenkins and the emo kid song.

@demonking86420 4 года назад

Emo kid song?

@julessmith2 9 лет назад

Crash Course and Bad Astronomer mash up is the best idea ever, thanks so much for these videos.

@wanderlustlovelace 9 лет назад

Wow, this is the third time someone has explained this to me in less than 12 hours! First my physics teacher, then Randall Munroe in What if, which I was reading during my lunch break and now Phil... I'm sure not going to forget this any time soon : )

@sheepwshotguns 9 лет назад

here's a silly question. what is the escape velocity of the universe :)

@marlonivancarranzabarrient787 9 лет назад

where would you be escaping to?

@pegeman1510 9 лет назад

As they always say in the science class, "no question is silly". The escape velocity of universe depends on which direction you want to escape and what gravitational force is in your way. If earth is the only object then your escape velocity is more than 11km/s and if there are more planets then you calculate the gravitational force according to the angle of the gravitational force minus the gravitational force of the planets ahead of you (which are pulling you in) according to their angle compared to your position.

@AllanDawnsun 9 лет назад

there's no length, breadth, height, or time, or anything outside the universe, so yea...and the universe is expanding at pretty darn fast rate..theories say that going to the edge of the universe doesn't really take you to the end, in fact, if you keep going, you'll reach where you've started. kinda like going around the earth..

@pegeman1510 9 лет назад

True, but I'm talking about normal conduction, which is universe is not moving or expanding and all the mass in the universe does not change or move. Same calculation as when we calculated the force at which two or multiple protons place on one another. In physics class when we calculate two trains moving towards each other, we are not considering the air resistance, wind speed, and friction. It makes the calculation hard and also discourages people from understanding the basic concept.

@doubleru 9 лет назад

I don't think it's possible to calculate the escape velocity of the universe because we do not know its exact mass. We can estimate the mass of observable universe, but that's just the portion of space 13.8 light years in all directions from Earth, and there is probably more stuff beyond that.

@SOLACEISHERE 8 лет назад

What would happen if objects gravity didn't extend out into the universe forever like they do now? Would anything change would we notice?

@Sam-oz8pn 8 лет назад

Depends on how the gravity dissipates.

@kristygillespie5039 6 лет назад

If all of the universe had gravity we would crash into other planets duh

@Akrafes 9 лет назад

I've yet to say this but i feel that i must by now. I love Crash Course and triple love Astronomy courses in it. Great job over all!

@tobithedestructor9129 9 лет назад

it's nice that you take your time to teach us all this. I guess that's partly why I like CrashCourse. Thank you so much Phil!

@geraldshort16 9 лет назад

Can you start: Crash Course: Mathematics. This will get tons of views.

@MK.5198 9 лет назад

I knew all this thanks to KSP and Scott Manley.

@under_the_night_sky5380 5 лет назад

Hen Barrison n

@afafalwan1515 8 лет назад

everything i learned about science at school this year in one video ! wow

@davidduffy9806 8 лет назад

Wonderful! Again I have learnt something new and have had my memory refreshed!

@seanyworny104 8 лет назад

I don't want that rock to escape:(

@fenmilosoft 7 лет назад

How dare you tell that rock what to do! Rocks have rights now! how don't you know this! have you been living under a ROCK! I'm so sorry.

@eugeneharold5005 4 года назад

lol

@ArchOfWinter 9 лет назад

I want the Enterprise to the left of the screen! Where did you guys get it?

@twelge15 9 лет назад

Enterprise from original series is better.

@bluetannery1527 9 лет назад

It's a Lego set. Go check it out :)

@Lucassymons 8 лет назад

Best quote ever, loved all of those books :) So long and thanks for all the fish.

@BeanSprouts02 6 лет назад

Wooow. This is actually great. I remember last year where we talked about the difference between mass and weight in class. One of my classmates said that mass is weight not influenced by gravity while weight is mass influenced by gravity, and my teacher agreed. Wew. Don't know how that happened. Good thing I watched this vid. Thanks

@marishkaaable 7 лет назад

Thank God there is CrashCourse

@corporallee44 7 лет назад

Probably a silly question, but Planet Earth has more mass than the moon, so why does it not pull it into itself or does the Earths circular velocity throw it out? I can't think of another way to describe it.

@krebs5636 7 лет назад

well, the moon was formed after the earth collided with an object of roughly the same format. Maybe the millions of small particles (which later formed the moon) were blown into space, and were constantly falling (on 4:20 phil explains that)

@tommyfinn8902 7 лет назад

Arnold Robert Lee The Moon is orbiting the Earth. Just like the Earth is orbiting the sun. So the reason the moon doesn't crash into the Earth is the same reason the Earth does not crash into the sun.

@ramsescoss5924 7 лет назад

Arnold Robert Lee The moon doesn't crash into earth because the gravity of earth and the gravity of the sun mame the moon stay in the middle

@feynstein1004 6 лет назад

For anything to fall down to earth (assuming the earth is motionless), all of its momentum (motion) has to be toward the earth. Consider the example of the ball. If you drop a ball from a height, all of its motion is in the downward direction (toward the earth). But if you give it a sideways push, it will still fall down but will land in a different spot because its motion is now in two directions: one is vertically downward toward the earth, the other is sideways, away from the earth. It just so happens that in this case, the downward motion is more powerful than the sideways motion. Hence the downward motion eventually wins and the ball hits the earth. However, if you give it enough sideways motion, the two motions will balance each other and the ball will get stuck. Its downward motion tries to bring it toward the earth but its sideways motion tries to take it away from the earth. And since the two are equal, the ball ends up doing neither. In other words, its distance from the earth doesn't change, which happens to be the definition of a circular orbit. I hope this helps. Btw things are a bit more complicated in reality because there are many more forces involved but this is essentially what happens. Hope this helps.

@raythegardener 9 лет назад

I love that the one source you quote within the video is Douglas Adams. I get most of my scientific understandings from his writings too.

@prashantbisht7500 9 лет назад

I wish i had teachers like you back in high school.Awesome videos,awesome explanation neat and well structured . Thank you.

@GrubbJunker 9 лет назад

Phil, you should have dressed as a princess yourself =( Nice video though ;D

@harshitsinghai1395 7 лет назад

I hope you kiss him goodbye first because it ain't coming back

@raulgcf1 9 лет назад

All I have to say is that you guys are f***ing awesome for posting all this incredible info in an easy to digest format for everyone!!! keep it up you guys rock.

@josephcallahan1664 2 года назад

Great job! I will be using this soon under the gravity of the requirements as an instructor.

@docopoper 9 лет назад

A Zillion light years away is older than the universe, so the earth's gravity wouldn't have reached there yet. :P

@iluvDNA100 9 лет назад

You're right, the "Speed of Gravity" must = c. It's almost proven, all we have to do is find the Graviton...

@docopoper 9 лет назад

Joe Seph Well if that wasn't the case then you could use gravity to send information faster than light.

@acemcbeanpiff 9 лет назад

docopoper Well, probably? But why would we need FTL communications before some kind of FTL or Near-FTL form of propulsion? I guess it would fix the problem of Time Delay for a while, but it isn't that.. well, useful

@MrQwerty2524 9 лет назад

A zillion light years is an distance, not a period of time. You are confusing it with looking back in time when observing a star that is a certain amount of light years away.

@ghuegel 9 лет назад

How many zeroes are in a zillion?

@Cosmalano 9 лет назад

The escape velocity of what is 11 km/s? You're saying that a marshmallow and a sport stadium would need to reach the same velocity to escape Earth's gravity? I guess it has to do with the acceleration due to gravity. Never thought that the escape velocity would be the same for all masses ("escape acceleration" would be different though I do believe).

@edwardmcdonagh7309 9 лет назад

yeah, but the force to be exerted on the stadium would have to be a lots greater than the marshmallow

@199NickYT 9 лет назад

Yes! But see, as he described with regards to mass, it would take a LOT more energy to get a stadium collectively up to 11 km/s than a marshmallow up to 11 km/s. Think about it this way: Voltron rockets off of Earth to its escape velocity of 11 km/s. Then, Voltron stops accelerating. At this state, the Cats-Bot is shooting away from the Earth without needing to speed up any more. Then, Voltron separates. What speed is each of the five wildcats traveling at? That's right, they're each still traveling at 11 km/s away from Earth! The speed of an object is not the same as the energy put into it. The speed is related to the energy put into an object, as well as the mass of it. P.S. BY THE WAY, Earth has an atmosphere. Even though you can build a marshmallow shooter that can pop out marshmallows at 11km/s, the marshmallow slows down due to air resistance far before it can escape the atmosphere. And shooting the marshmallow away from the Earth at a higher speed so that it would slow down to 11km/s when it reaches the edge of the atmosphere...would vaporize the marshmallow before it even got there. :(

@seigeengine 9 лет назад

This is for the same reason that if you drop two things of different masses they fall at the same rate.

@Cosmalano 9 лет назад

They are following tandex lines?

@Cosmalano 9 лет назад

Nick V the acceleration a mass would need to experience so that it had enough energy to escape Earth.

@kaleba5203 9 лет назад

The starting music of this Crash Course is by far my favorite

@wmarclocher 9 лет назад

Wow! I learned a lot in this episode, thanks Phil!

@emmacloud4739 9 лет назад

BUT WHAT CAUSES GRAVITYYYYY

@unvergebeneid 9 лет назад

Wow, I didn't find anything to nitpick this time. Everything was really carefully phrased. Actually, it almost sounded a bit forced ... hey, that was a joke! It was a joke, ok?

@Cosmalano 9 лет назад

I didn't think it was that great.

@unvergebeneid 9 лет назад

electrocat1 I'm not keeping _you_ from nitpicking if you found loads of stuff.

@LughSummerson 9 лет назад

Maybe a bit forced, but he's dynamic and attractive.

@abitugly 9 лет назад

By far my favorite Crash Course series to date!

@yacinetharrafi7281 2 года назад

This video really helped me. Thank you very much!

@MaryJane-bo6lj 7 лет назад

SPOILER ALERT Gravity isn't a force. It's all about curves ;) EDIT: Sorry guys, a lot of what you deliver is great and of a high quality standard, but this was just poor. I'm sure this video was aimed for a particular audience but you could at least mention that the best theory of gravity we have (Einsteins Relativity no less) demonstrates that Gravity isn't a force and that its really about the curving of what can be thought of as a 4D mathematical space and then reassure viewers to just think of it as a force for the sake of this video (you know, to keep things simple). When you mentioned that gravity warps the space around it, close, but that would be that mass warps spacetime (relativity again). For those interested to know, gravity is NOT a force and really everything just moves in straight line vectors within the curvature of spacetime - spacetime being curved by MASS. Gravity doesn't bend light, mass bends spacetime and photons still travel in straight lines within a curved space (not light travelling in curves in a flat space). Also, please excuse my avatar, I am a liberal and believe in peoples right to choose. Although I don't partake as much as I once did, it was blazing that got me fascinated and literally opened my mind to theoretical physics... dude.

@fringeofdestiny1247 7 лет назад

GRAVITY, DONT MEAN TOO MUCH TO ME

@sophiaz907 7 лет назад

OMG YESSS

@Dooality 9 лет назад

I love this series. This is probably the best video yet.

@RoopsDiary Год назад

If only I had came across this series during high school my Physics scores would have been so good.

@mujii_22 8 лет назад

wait we live on a planet, i thought it was the earth?

@theutopianoutopioan464 6 лет назад

Gunflower, Earth is a planet! So are Mercury, Venus, Mars, Jupiter, Saturn, Uranus and Neptune, as well as thousands of similar bodies orbiting other stars

@PickyMcCritical 6 лет назад

+The Utopiano Utopioan I think it was a joke. Hard to tell online tho :)

@kudos4201 6 лет назад

We live in a society

@Mohamed-jv6nv 5 лет назад

No!!! We live on land. God why are these people so stupid?

@MrCaptainPatters 8 лет назад

FUCK, I JUST REALISED SPACE IS CALLED SPACE BECAUSE ITS EMPTY SPACE WHY DIDN'T THEY TEACH THAT SHIT IN SCHOOL ARRRRRRRRRGH FUCK MY LIFE UGGGGGGGGGGGGGGGGH

@afafalwan1515 8 лет назад

Same XD

@jackcondas202 7 лет назад

Space isn't empty at all... Like at not even close to being empty, lmao

@DM-pz5ip 9 лет назад

excellent job! More more more!!

@iTiffanyi 9 лет назад

This is where things get confusing for me. I just don't understand mass and velocity. But still good to learn about it!! Another great video in this series!

@coolaid4132 6 лет назад

"What goes up, must come down" *NOBEL PRIZE AWARD*

@MidwestHippies 9 лет назад

Next on CC Astronomy ...Meteor showers!!! Yeah? Can we get that maybe? Next after Tides that is. That should be a good episode :) This series is awesome, I love it!

@garethdean6382 9 лет назад

Very attractive presentation here dealing with such weighty matters must have been a massive task.

@benaaronmusic 9 лет назад

Great informative video.

@ramana3349 7 лет назад

Excellent series.. thank you

@johanneszwilling 9 лет назад

Best Video yet in this course

@sangeethkumarkotagiri2925 7 лет назад

thanks!nice video it has cleared my all doubts

@kwickiesparticuss9964 5 лет назад

Wow this was mind boggling. I've watched this 5 times back to back.

@vrstovsek 9 лет назад

This was a great episode!

@MuslimAmericanGirlz 9 лет назад

Great episode!

@Nyt250 8 лет назад

Finally a proper explanation in the difference between mass and weight, THANK YOU

@OdysseyWorks 9 лет назад

Wow love these series! You rock hard!

@chamelikasamarakoon6213 11 месяцев назад

you are the best teacher who teach astronomy science

@piemaster6512 9 лет назад

Love this series

@terraflops 9 лет назад

i enjoyed this video and the graphics really helped me. more graphics the better. i understand the gravity weakness inverse ratio better than before due to the graphic. Thanks.

@Mastro_ 9 лет назад

Make videos forever pls. Love these

@maremaarten 6 лет назад

just starting to view this. May I say that this is awesome? Thanks!

@mathematicianjeff8358 6 лет назад

Free falling in space. That is a great explanation. I liked this video a lot!

@phatamgiang8148 7 лет назад

Thank you for a great explanation. It helps me understand more about gravity. I wish you make a video about vectors in one dimension and then two dimension. Once again, thank you for a great lesson.