Questions regarding electromagnetic radiation in the visible spectrum.

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13
votes
4answers
716 views

Is the light we see from stars extremely old?

Our nearest star Proxima Centauri is 4.243 light years away from Earth. Does that mean we are seeing light that is 4.243 years old everyday?
17
votes
3answers
463 views

Why can't light escape from a black hole?

I've heard that light can't escape from a black hole. Can it? If not, why?
4
votes
2answers
136 views

How does light affect the universe?

When light is emitted by for example a star, that star loses energy - which causes it to reduce its gravity. Then that energy begins a journey for potentially billions of years, until it reaches some ...
3
votes
4answers
320 views

What would the effects be on Earth if Jupiter was turned into a star?

In Clarke's book 2010, the monolith and its brethren turned Jupiter into the small star nicknamed Lucifer. Ignoring the reality that we won't have any magical ...
2
votes
1answer
43 views

What is the ratio of cosmic microwave background radiation to normal radiation?

I would like to know the ratio of cosmic microwave background radiation to normal radiation in the universe. I am considering cosmic microwave background radiation to include the microwave, and any ...
1
vote
2answers
125 views

Is it dark inside a black hole?

Assuming you could be standing inside a black hole, would it be light or dark around you?
-2
votes
1answer
179 views

Is it possible that we see our solar system as a star?

A few days ago I just read here that our galaxies (one of which we are part of) move or expand faster than light, And read here that light we see from stars is extremely old, maybe more than several ...