FACTS THAT WILL MAKE YOU QUESTION EVERYTHING! 

I like this trio on this video, they let each other speak instead of talking over each other and they actually react instead of just watch the vid. More of these please

I just wanna say I appreciate vik being the most level headed sidemen and listening to literally EVERYTHING the others say and genuinely giving them time no matter how trivial it is

These are the perfect combination. Harry confused about every fact and question "How", Simon disagreeing with facts and Vik trying to explain every fact with pretty resonable answer.

This trio for such videos is top notch 😂 Vikk the megamind Harry the questioner Simon the person of both parties 😂😂

They need to do more of these types of reactions.

Whats funny is that Simon already reacted to this exact video about 2 months ago with Josh and Tobi. He even says "I feel like ive watched this video multiple times and forgotten everything".

As a physicist, Vik’s knowledge/understand is surprisingly very very good

This had me dying HAHAHA

Genuinely one of the best reacts in a while. Harry is gold 😂

Harry getting his mind blown and questioning everything is top tier comedy 😂😂😂

Easily one of the best sidemen reacts yet. Making jokes and funny banter rather than blankly staring at a screen.

Vik's attempts at even vaguely justifying the sheer expanse of space and the reasons why to Harry and Simon is so impressive. It is such a baffling concept as a whole and Vik identifying doppler shift as an example is so impressive and makes me respect him even more. Good work lads

9:11 Vik's guess is marginally correct for how they know what it looks like. As we are in the Milky Way, we cannot see it from the outside so scientists have to use techniques looking into the plane that we see from inside. Scientists cannot use visible light to determine what our galaxy looks like as it gets absorbed by lots of dust within the galaxy. However, there is also a lot of hydrogen in the Milky Way which emits radiowaves, and the different shifts in these radiowaves can be used to make a picture of what our galaxy looks like, aided by seeing the shape of other galaxies.

To answer the question at 5:00, the satellites transmit the images as radio waves back to Earth where they are received by massive radio dishes. The reason Wi-Fi signals have a relatively short range is mainly because they operate within a specific frequency band known as the "unlicensed spectrum." This spectrum is also shared by various other devices like cordless phones, Bluetooth devices, and microwave ovens. The limited range helps minimize interference between these devices and ensures that they can coexist without causing significant disruption to each other's signals. Additionally, Wi-Fi signals are affected by physical obstacles such as walls, floors, and other objects that can attenuate or weaken the signal strength. To maintain a balance between usability, efficiency, and interference, Wi-Fi technology is designed to operate within a range that provides a good balance of coverage and signal quality for most common use cases.

I don’t know why but Harry vibing to the music is a mood 11:33

Someone needs to make an 1 hour compilation of Harry's reactions 😂

Love these types of videos, just chill philosophical discussions

11:13, okay so I can help with that question Harry. You see, scientists use this thing (I forgot the actual name but I will tell you what it does) they take a continuous picture of a star and pass it through a spectrometer. Whenever a planet passes in between the Earth and the star, there is a dip in the intensity of the light and based on the dip, scientists can calculate the size shape, color, etc. I do not know that gravitational lensing does something while the scientist is taking these measurements but yeah that's pretty much it. But yeah, as you all may have guessed, the dip in intensity is really really small so they do need that precise and sensitive instrument

vik identifying doppler shift and using it as an example, it reminds me he declined an offer to study natural sciences at UCL. i forget he’s actually 5Head. really enjoy him in the STEM related reacts.

3:59 Vik has improved a lot

There should be a whole series of Harry watching informations videos or crazy science theories with Vic and Simon hahaha

This trio is golden, we need more of them together here.

Harry Having an existential crisis for 10 mins was relatable 😂

This is one of the best groups for an educational react. Deep reflection, philosophical questions. Just learning so much

5:43 Don’t think we didn’t notice, Vik.

Watching Harry try to process the information is hilarious.

9:29 Wavelength shifts in light, also referred to as redshifts and and blueshifts are used to determine the velocity of stars or galaxies. This is thanks to the Doppler effect. You can hear it with sound as well: when you hear an ambulance coming towards you, the sound of the sirens is high-pitch (shorter wavelengths), and when the ambulance is moving away from you the sound has a lower pitch (longer wavelengths). This way, by analyzing the spectra of the stars and galaxies, astronomists can find shifts in wavelengths (blueshift when it is shifted towards the blues and redshift when it is shifted towards the reds) and determine at what speed celestial bodies are moving towards or away from us

I just question how many videos the sidemen film a day 😂

Vikk cooking them with logic and science 😂

When harry says “how can we see what these look like when we’re in one of them” (around 11:00) think of this analogy, you might be in your own house but if you look out the window, you can still see other houses around you

@2:29 I prefer the old office 😢

5:50 they forgot that radiowave transmission still exists which don't need any medium to travel

1:15 Harry just pulled a KSI😂😂

I am an aerospace major and what I figured about layman knowing shit about space is almost zero to none (I am in the field of space still I find some things blowing my mind everyday), but vikk is on a different level. I know they are content creators and stuff so I don't aspect them to know much like harry and simone but vik's knowledge shocked me, man knows something about everything.

Vik is him. Every time the others questioned something he answered it perfectly

Harry thinking that everyone is a part of his simulation is so funny

3:30 - "It looks like dirt and rocks bro, it doesn't look like a dinner." Harry makes me laugh so much 😂

Please more videos like this! Love hearing harry pick these things apart

12:47 LOLOL *Harry screams in existential frustration*

Simon reacting like he hasn’t already reacted to this video 2 months ago

My favorite part of the video is Harry's baffled expression at 11:09 how can you not love this man😂

5:44 At least Vik continues talking here😂

Love how Vik was spouting out some GCSE Physics 😂

classic Harry Moment 🐱🤣3:52

This is the perfect trio for info videos. Vik is intelligent and literal speaking facts. Harry spouting some random ass questions and thoughts. Simon being devils advocate.

vik is actually smart knowing about red shift and doppler shift is advanced knowledge fair play

We need jj and Ethan in this type of vids

I love how passionate Harry gets with these types of videos

3:45 "Fuck me that's giant a flaming ball" -bog

Harry seems to be the kind of guy who would be fun to talk on a long trip

I love Harrys honesty! Simon feels like he's not believing any of this. Smart Simon!

Real ones know that Josh, Tobi, and Simon already reacted to this video

FAX... no printers. Vik is honestly the funniest

Harry defending the Sun's 🌞 honor was so wholesome 🧡

I enjoyed this react! Great discussion by Vik, Harry, and Simon!

harry questioning everything is gold😭

This is the type of reacts we like

Still kills me vikk always just rewording what the video says and everyone thinking he’s smart 😂

Man Harry and Simon are like those old blokes who refuse to believe anything 😂

I love watching Harry's brain just try to process knowledge that goes way beyond his scope of understanding 😆😭

10:02 Simon has already watched this on sidemen reacts 2 months ago 🤣

Sometimes i think Vikk was always destined to become a scientist or engineer but somehow became a successful youtuber

Seeing vikstar talk about red shift after I finished my gcse physics exsams make me feel so smart

I love these kinds of reacts, please do more of them!

4:57 Oi Simon, the picture was taken from the Voyager 1 space probe, and its currently located 23 billion km or 123 AU”s away from earth, NASA still receive signals from it.

10:27 Bog: hear me out, this is real Also bog: how the fuck is this real

Harry talking about how big the sun is makes him seem like the only person there who’s really stepped back and taken a look at the world around him, he’s got a point when he says “how do you not notice the size of the sun, a big flaming ball in the sky” he takes a minute to appreciate and realise the little things that are vastly overlooked by many who pass by it everyday

Viks got a new office let's goo🤣

12:36 exe.harry has stopped responding

Nothing like questioning your whole reality on a Wednesday evening.

Watching them explore their own reactions to science is so great! Love seeing it!

All of them were interested and asked questions about it. Having Simon vik and harry was perfect for this video.

i SWEAR SIMON reacted to this exact video where he argues 6:40 how many sand grains there can be . WHAT are sidemen reacts doing . Josh, Tobi, and Simon already reacted to this video

finally a good video, not just *best sidemen moments*

Vik trying to tutor primary schoolers 🤣

more of these vids please its educating and fun to watch ❤

*I think we can all agree that these are the BEST type of reaction videos.*

I love how simon has already reacted to this video😂

vik talking about shift in wavelength to measure distance reminded me of a levels

They are back with the classics! Do these more man, there are so many such videos out there, good area to explore the world!

These 3 need a science lesson 😂 more vids like this, please!

Vikk thinking a satellite 4 billion miles away had a Wi-Fi connection is one of the dumbest things he has ever said 🤦‍♂️

As a Saints I love those dudes please keep questioning every thing 🤣🤣

1:53 it's not much, just rocket science.

I love watching space facts videos, and seeing them react to it just made it much better to watch, definitely would love to see more

Educational reacts are the best, it shows you how clueless everyone is except for vik.

Vik was spot on when trying to explain how they calculate these distances in space Using the red shift ans blue shift of light that reaches us from stars far away

I knew Harry wasn't the smartest but holy smokes 😂

Harry's existential crisis was a delight to see haha

Just realised on a rewatch that the video they reacted to here is almost identical to the one they reacted to in '27 Facts that will make you question everything!'

They should always bring Vik on when they're doing science reacts. It's so much better with him there explaining things to the others.

Finally an informative and interesting video to react to

As an astrodynamacist, these reactions were hilarious

My favourite part of the video is that this channel has already reacted to this video.

All Harry and Simon needs as a source is ''I heard some people say'' lmfao.

Favourite Trio ❤ But Tobi needs to be in these kind of videos

Already reacted to this vid guys. Sidemen get caught lacking again.

I back Harry. I'm glad he was up for asking questions, reacts is always better when there's actual conversations in my opinion.

I love the Wi-Fi convocation when you can still take photos without Wi-Fi 😂

2:23 Na bring back the office that looks terrible