Since the beginning of Earth's history, tiny particles of rock and metal from space have been hitting our planet. On clear ...

There are currently no other explanations for the effects that we see, nor for the myriad other P9-induced effects we see on ...

Mars may seem lifeless now, but experts are revealing bold strategies to change that. The vision for a habitable planet is ...

The stellar companion may help explain why the brightness of Betelgeuse, the red supergiant, is open to so much variation.