As astronomers study an exoplanet called K2-18b, conflicting research reveals how difficult it is to find evidence of life ...

Arsia Mons, which dwarfs Earth's tallest volcanoes, and its two neighboring volcanoes are often surrounded by water ice ...

On May 2, as sunlight crept over the Martian horizon, the Odyssey spacecraft captured Arsia Mons, a towering, long-extinct volcano, puncturing a glowing band of greenish haze in the planet’s upper ...

The nights surrounding June 7 will see Jupiter and Mercury crowd together close to the horizon in the northwestern sky.

Arsia Mons, the southernmost of the Tharsis Montes trio, stands at an awe-inspiring 20 kilometers high, dwarfing Earth’s ...

Earth’s tilt is what causes the seasons; in the summer, when our planet’s pole is tipped toward the sun, the days are longer, ...

This month will usher in two separate conjunctions — one between the moon and a rarely-visible Mercury, and another between ...

As a result of the International Astronomical Union’s 2006 demotion of Pluto from planet to dwarf planet, our solar system ...

New research on the orbits of these mysterious asteroids near Venus stress the need for better space rock surveillance.

Enjoy a close conjunction of the solar system’s smallest and largest planet just days before the Full Strawberry Moon this ...