Could a lonely planet wander aimlessly through the restless galaxy change the subtle dance of gravity within our solar system? Astronomers have new cause to investigate. With powerful telescopic ...

Since the 1950s, scientists have known that the Sun emits a stream of particles in a vast wind, carrying away an Earth’s worth of mass every 150 years. This wind of protons sweeps by comets and ...

CAPE CANAVERAL, Fla. — Astronomers have discovered the earliest seeds of rocky planets forming in the gas around a baby sun-like star, providing a precious peek into the dawn of our own solar system.

Our solar system is a smashing success. A new study suggests that from its earliest period—even before the last of its ...