How Much Does a Shadow Weigh?

Veritasium SLINKY video: http://bit.ly/SGD73o
Veritasium channel... SUBSCRIBE: http://bit.ly/RoMMH7
A great Veritasium episode about using video to teach: http://bit.ly/VOsZVx

Vsauce2 LEANBACK about shadows: http://bit.ly/VOt8rP

Vsauce3 explains how realistic SimCity is... SUBSCRIBE: http://bit.ly/PMThlp

ALL MUSIC BY: http://www.soundcloud.com/JakeChudnow
Jake's YouTube channel: https://www.youtube.com/jakechudnow

Vsauce on Twitter (lots of extra mindblows): http://www.Twitter.com/TweetSauce
Vsauce on Facebook (your chance to blow MY MIND): http://www.Facebook.com/VsauceGaming

Hand shadow book: http://books.google.co.uk/books/about...

Light "pushes" us: http://www.straightdope.com/columns/r...

Solar Sail: http://www.jspec.jaxa.jp/e/activity/i...

solar sail GIF: http://www.jspec.jaxa.jp/e/activity/i...

Venutian Shadows: http://www.digitalsky.org.uk/venus/sh...

Speed of light in different materials: http://cadlab6.mit.edu/2.009.wiki/anc...

sonic boom demonstration: http://demonstrations.wolfram.com/Wav...

Cherenkov radiation: http://profmattstrassler.com/articles...

and: http://en.wikipedia.org/wiki/Cherenko...

Photonic booms in your eyes: http://en.wikipedia.org/wiki/Cosmic_r...

Pushing a lightyear-long object: http://www.physicsforums.com/showthre...

compression / longitudinal waves: http://en.wikipedia.org/wiki/Longitud...

cool site for putting things in perspective (this link is for 1 sq. inch): http://www.bluebulbprojects.com/measu...

Also this is important: http://animalsbeingdicks.com/post/231...

• Category

  Science & Technology

[rubikfan1]

7:28 now all fat people are ganne way them self in the dark lol

[Christoik]

But a distorded slinky has a kind of energy stored and when freefalling it convertes it to "push signals".

If i had a SOLID tube 1 lightyear long that doesn't need to send "push signals" because it is solid (think of the most solid material in the universe) and all the energy required to push that tube, wouldn't the button at the other end of the tube be pushed instantly?

[Kevin Jason]

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[Victor Willis]

No, nothing's solid. That tube would be made of atoms, obviously, and the atoms in the material would still experience the shock wave since atoms are spaced (VERY FUCKING FAR) apart. Solid is an illusion, empty space consumes most of the volume of the universe.

[YannisVdEcker]

A long time ago i wondered whether it was possible to make a giant mirror, put it in space (I mean a humongous distance away from here) and then build a sort of telescope to look at it. I know it's a theoretical question but would we able to look into history that way? Light is travelling, fast but with a speed, so if we take a glance at the mirror, the light that reflects in the mirror could be taking so much time that what we see is already past? This thought stole my sleep for weeks...

[Masalmeh321]

No. Theoretically, you shouldn't even be able to see the light. The speed of light is the speed of light, it won't be faster if you go faster. The light will stay in the filament of the bulb (it will actually go at the speed of light, but so are you so it evens out to 0). This is all theoretical, though, because you can't actually drive a car at the speed of light.

[adamgrocco]

If you were in a vehicle travelling at the speed of light and you shone a flashlight out the front?

Would the light from the torch travel twice the speed of light to an observer stood still?

[Huw Sensier]

Vsauce is an evil genius; he lures us in with interesting titles and then fills our minds with so much more than just the answer to the original question.

[michelle Meow]

well my parents wont let me have a cell phone yet but i might get one soon...so no texting.

[Longspree21393]

Let us say I am in 4th grade..... I still speak the common earth language better then you do. From what you said I doubt you know what you are typing. I bet you are just bashing your keyboard being lucky to get (SOME) Human words right. You have the education of a 10 year old.... ._.