From the fall of an apple to the glow of the farthest known star, gravity quietly choreographs almost everything that happens ...

Why don't planets fall into the stars they orbit if they're constantly being pulled by gravity? Lindsey Coughter Rocky Mount, North Carolina This is a brilliant question because the notion of an orbit ...

A newly discovered exoplanet is rewriting the rules of what planets can be. Orbiting a city-sized neutron star, this Jupiter-mass world has a bizarre carbon-rich atmosphere filled with soot clouds and ...

When I was a kid, there were nine planets. Now we know of thousands! But that includes exoplanets, alien worlds that orbit alien suns. Only eight planets call our solar system home. Or there might ...