So, if the planet doesn't orbit a sun, can it still be called a planet?
How can you tell how far away stars, planets, and comets are without modern instruments?
After the country's most star-spangled holiday, NASA adds a few more to the stellar catalog.
Astronomers have proposed two theories to explain the mysterious origin of blue stragglers.
What makes the sun shine? It's a question we rarely give much thought. However, there is a scientific explanation for this commonplace phenomenon.
The physicist Artur Eddington once said he hoped one day science would have advanced far enough to understand "so simple a thing as a star."
Have you ever considered the possibility that the sun will eventually burn out?
The theory behind this legend goes like this: Daytime is bright, due to the sun. If you view a sunless piece of sky through a long tunnel, there should be no way for the sunlight to get into your eyes. Therefore, you should see stars.
To really behold the stars these days, you have to travel far from cities and towns to escape urban glow. The magnificent sight of the Milky Way, for example, can now only be seen in rural areas. But why do we shine light up into the sky in the first place? We need light shining down on streets and walkways–not up into the sky!