Magazine | Page 182 of 278 | Astronomy.com

I heard that the light from nuclear fusion reactions in the Sun’s core takes about 200,000 years to reach its surface. I thought the speed of light is constant. Why does it take so long?

Galaxies, Science

Go beyond the Galaxy Zoo classifications

The “Red Region”

Bob Berman’s Strange Universe: Our bodies, our neutrinos

The universe has billions of galaxies and billions of stars, so why is space dark?

David H. Levy’s Evening Stars: 50 years strong: a national observatory to be proud of

Observing Basics web extra: Track down more Scorpius double stars

Could the elusive neutrino particle be a component of dark energy?

I saw a shooting star tonight; as it burnt up in the atmosphere, it became a brilliant green. I have seen only yellow and white ones before. What causes the green color? Or could I have seen space junk burn up?

How you can do science from your backyard

If all the known matter in the universe were compressed into one colossal black hole, how big would it be (both size and mass)?

Neptune returns to its origin