Carl Sagan on looking out into space = back into time

"We see that space and time are intertwined; we cannot look out into space, without looking back into time" This clip is from Carl Sagan's Cosmos episode 8, "Journeys in Space and Time."

Category:

Science & Technology

Tags:

• Carl
• Sagan
• Cosmos
• Universe
• Stars
• Earth
• Space
• Astronomy
• Science
• Atoms
• Chemistry
• Physics
• Math
• Humanity
• World

[JP5466]

Thanks for posting this. In 1980 I was 14 years old. Every Tueday night at 9pm I was tuned into my local PBS station watching amazing this show. It really made me think about the universe and how awesome it all is.

[XXXSDESDEXXX]

Your welcome. No matter how many times I watch these clips, I am struck with awe each time.

[mohfoz77]

CARL SAGAN we miss you dearly.

[1billion1deaths1]

LIGHT IS EVERYTHING,Sound ,memories, thoughts are light , Extraterrestrial elements.

[masroorabbas]

@JP5466 Amazing isnt it in in 1980 I was not even born...in fact I was born 6 years after that and today we both are watching this awesome video!!!!!lol

[KayBeeEee1983]

Speaking of going back in time, when's the turtleneck & sportcoat combo gonna make a comeback?

[toonuraccoon]

@XXXSDESDEXXX dude, I am like that right now. I watched these so amny times it's just so hard NOT to be impressed. Really truly awesome man is our Carl Sagan.

[isaacisblackmagic]

i wanted to keep on watching lol :(

[snookerjam]

i just recently discover this wonderful scientist, its absolutely great listen to him and also his voice make me calm and focused to his messages. he was a very very bright and intelligent man

[WOWJBEOWULF]

The Universe is infinite. If the Universe were finite, we would be like a hot cup of coffee, heated to the energy of the stars (like putting an airconditioner in the bottom of a mine, there is no place to pump the heat energy, it does nothing except have a hot side and cold side on the heat pump). The only explanation left is the Universe is infinite (i.e. very large). Heisenberg's Uncertainty Principle states nothing is impossible, as momentum & position is known, thus infinite Creation.

[CAGftw00]

Yes we can. All around us. Any time you can use Hubble or Swift. Among others, Carl Sagan.

[CAGftw00]

That is the prevailing view of generations past, prior to the prevalence of the big bang. Astronomers today know that if the universe was created at a single point, then it must have definite edges, albeit expanding ones. So you are not completely off in this thinking...what you are saying was the widely accepted view prior to the prevalence of big bang thinking.

[CAGftw00]

To answer your question, the edges of the observable universe are about 13.7 billion lightyears away. This figure comes from the fact that when we focus our telescopes as far as they can see, no information is returned beyond 13.7B LY away - its only static beyond that point. Also the light from that time was 'emitted' from the big bang - the start of all things. Ergo it hasnt taken 13.7B LY to reach us, but rather it has been there, at the edge of the universe, waiting to be seen, for 13.7B LY.