A new theoretical study offers a possible explanation for how the Universe can grow more complex without violating the second ...

How do you explore the interior of a planet without ever touching down on it? Start by watching the way the planet spins, then measure how your spacecraft orbits it — very, very carefully. This is ...

Gravity seems constant but it turns out, Earth is weirder than that. Gravity actually wobbles a bit across the planet. And the weakest spot isn’t the oceans or the mountains but right under Antarctica ...

Thanks to the discovery of thousands of exoplanets to date, we know that planets bigger than Earth but smaller than Neptune orbit most stars. Oddly, our sun lacks such a planet. That's been a source ...