There are a couple of ways that scientists can date planets, so which planets formed first in our solar system?

A newly discovered warp in the outer Solar System may have been created by a small, rocky world, much closer to the Sun than ...

A low-density, puffy planet orbiting relatively far from a young star in a nearly perpendicular orbit. What's going on?

A new study has proposed the existence of Planet Y, an alternative Planet Nine candidate that is smaller and closer to Earth ...

Full Video- http://www.youtube.com/watch?v=WHNO079G1i8 Pluto, Eris, and the Dwarf Planets of the Outer Solar System Exploring Space Lecture webcast live on Tuesday ...

Viewed from orbit, Jackass Flats — situated in southern Nevada about 65 miles northwest of Las Vegas — could easily be ...

"It shows that Makemake is not an inactive remnant of the outer solar system, but a dynamic body where methane ice is still ...

Space scientists look back on 30 years of exoplanet discoveries — from rows of massive ‘super-Earths‘ to worlds with ...

Voyager 1 is about to go where no human-carrying spaceship has gone before. June 15, 2012— -- Fifty-five years after humans first escaped the bounds of Earth and launched a satellite into orbit, ...