RSS Feed

3/17/2017

Topic Reading-Vol.1801-3/17/2017

Dear MEL Topic Readers,
The fact the sky is dark reveals a lot about the Universe
The sky is blue in the daytime, provided that there are no clouds over you. Likewise, the sky is dark at night, unless a supermoon reflects the sunlight brightly. You know that, but have you ever questioned yourself, or someone else, why the sky is dark at night?
Though there are hundreds of billions of live stars shining in the universe, they don’t seem to be bright enough to make the universe white or even gray. You might think that those stars are too far away from Earth. Yes, indeed. The age of the light from a star could be as old as 13.7 billion years because it was the time when the universe was born, the Big Bang. But the lights that reach Earth might have travelled even longer light years because the universe is still expanding faster than the speed of light. It sounds too dim for any light to brighten this dark universe, doesn’t it?
Enjoy seeing this animation video to learn about stars and universe.

If you are also interested in why the sky is blue question, check this out.

http://www.todayifoundout.com/index.php/2010/05/why-the-sky-is-blue/

No comments:

Post a Comment