Cosmos Episode 8: Journeys In Space and Time Part 7 of 7

[Baltahfeek]

what's the name of that tune at 3:22 onward?

[AlanEricFan]

@Baltahfeek Pulstar by Vangelis. A complete listing of music can be found here: cosmic_voyager.tripod.com/cosm­osindex.htm

[0Dimac]

awesomes!

[dewfall56]

This kind of thing is the only reason I would want to be immortal. To see dreams of this age be realized a thousand years from now. So different will mankind be, that we would truly be aliens in their age.

[Riggro]

I'm all up to promote Carl Sagan to the rank of God.... who's with me?

[AnnastezhaaMC]

@Riggro I'm with you! or at least to the rank of understanding most clearly what God is

[adaseth]

I was looking for this space dialation effect everywhere. This is great. Pity, they didn't show, how it would be, if you looked back when traveling close to c.

[vaibhav1P]

@adaseth

Due to space contraction everything gets squished in front of us. So if u look behind u probably wont be able to see anything.

[adaseth]

@vaibhav1P That's what I don't understand- light travels for you at the speed of light, so the light from the star behind you should be visible just the same as when you stand still.

Where do I make a mistake in my thinking?

[vaibhav1P]

@adaseth

I missed an important information there. only that part of the light from a source which is exactly opposite to ur direction of motion wont get affected. everything else will get squished in front of u. I think u will see a narrow band of light if u look behind wen travelling close to c and the band will get narrower and narrower as u approach c.

[vaibhav1P]

@adaseth

light doesnt travel faster in order to get contracted in front of u. the angle at which light strikes u changes due to relativistic aberration.

[adaseth]

@vaibhav1P Ok, but WHY is this aberration happening? I mean space does not fold around you, because you're travelling fast. None of the relativistc effects I know of should cause this...

[vaibhav1P]

@adaseth

anything which is transverse or has a transverse component to the direction in which u are travelling, will appear to be slanted. the same is the case with rain droplets wen u see them from a moving car. the only difference between rain droplets falling on the wind screen of a moving car and light is that light has a speed limit which cannot be exceeded. so relativistic effects have to be taken into consideration.

[tskasa1]

Can somebody remind me why we have religions on a God we don't know when we have Carl Sagan? :33

[Kabukita]

As soon as he said he wrote a novel it was sold to me.

[Jammed9000]

@Kabukita

You should see the movie that was based on the novel "Contact"

[conan099]

haha see im not crazy! you can travel time >:D

[faridjabba]

LVOEEEEEEEEEEE IT

[quietAtheist20]

truly amazing stuff!!! :)

[faridjabba]

10 YERAS AFTER OR 15_ >?I THINI `15

[CKtheFat]

I'm guessing his book was the inspiration for the movie Contact. (Good watch, by the way.)

[Kaine386]

Contact was actually based on a novel written by Carl Sagan. The only fiction he ever wrote.

[quexalcoatl]

Sagan is a wonderful teacher. Love the whole series.

[elemilex]

HE'S THE BEST :-)

[Zach1O8]

awesome videos