Night time is only dark because the universe isn't infinitely old

[yhelothar]

http://www.wimp.com/skydark/

 

[bignateyk]

Why is the sky dark at night? Because we aren't facing the sun.

 

[IronWing]

Why is the sky dark at night? Because we aren't facing the sun.

No, it's dark because god knew we'd want to sleep and designed it that way. Darkness moves across the sky like a closing eye lid. Coincidence? I think not.

 

[bignateyk]

No, it's dark because god knew we'd want to sleep and designed it that way. Darkness moves across the sky like a closing eye lid. Coincidence? I think not.

No, No, it's because we aren't facing the sun. Do I get my honorary astronomy degree now?

 

[yhelothar]

Why is the sky dark at night? Because we aren't facing the sun.

 

[tatteredpotato]

I'd heard before astronomers weren't sure why it gets dark at night.... according to them there should be enough light out there regardless.

 

[Schadenfroh]

I'd heard before astronomers weren't sure why it gets dark at night.... according to them there should be enough light out there regardless.

To add more confusion:
http://www.popsci.com/science/artic...eyond-known-universe-tugging-visible-galaxies

Mysterious Dark Force From Outside Tugs at Our Universe

...

The NASA scientists first discovered dark flow in 2008

...

the NASA team believes that dark flow is actually the gravitational pull of massive objects beyond the edge of the known universe.

 

[Cerpin Taxt]

Alex Grey is awesome.

 

[ViviTheMage]

Light doesn't bend?? Not sure..God has nothing to do with it .

 

[bunnyfubbles]

Universal expansion means in a few hundred billion years, galaxies will be moving away from each other faster than the speed of light, which means light will not be observable outside of one's own galaxy.

 

[JTsyo]

To add more confusion:
http://www.popsci.com/science/artic...eyond-known-universe-tugging-visible-galaxies

Past that, there may very well be massive objects. But since the universe is expanding, their light will never reach us, and thus we cannot observe them along the electromagnetic spectrum.

Gravity is FTL?

Since stars are born and die, would the amount of light reach a steady state if the birth/death rate stays uniform? Light also gets weak at a cubic rate so if stars are far away enough, the photons might not intersect with earth.

 

[silverpig]

I'd heard before astronomers weren't sure why it gets dark at night.... according to them there should be enough light out there regardless.

That was a long time ago and it was known as Olbers' paradox. Basically the argument goes:

If the universe is infinite and infinitely old, then anywhere we look, our line of sight should eventually end at a star. If this is true, then it should always be daytime (really intense daytime).

This is one of the main arguments against an infinitely old universe.

 

[destrekor]

I'd heard before astronomers weren't sure why it gets dark at night.... according to them there should be enough light out there regardless.

Well... there is an insane amount of light bombarding our little watery world every single moment. Fact is, so much of that light is simply light we cannot see as our eyes are limited to a few hundred nanometers of total EM viewing ability... what we see is less than a few percent of can be seen.. by something, maybe.