The Kepler space telescope has shown us that we live in a galaxy full of Earth-sized planets.
Did you know it seems we're discovering a new exoplanet every week?
If you've ever glanced skyward, you've probably noticed the sheer numbers of stars. Some are tiny, barely visible points. Others radiate strong white light.
Supernovas explode with a bright burst of radiation, giving off as much energy in a few days as our sun will give off in its entire lifetime.
When we are in a fairly dark room, or outside at night away from lights, we can still see, but we can't see the colors of things very well. Why is that?
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.