Debate has raged for two decades over whether Pluto should be considered a planet. Some want President Trump to take action via executive order.

Earlier estimates of its age were around 7 billion years, but a new study suggests it’s much older.

When Anastasios Tzanidakis was sifting through some older telescope observations, he stumbled across something that should ...

Add Yahoo as a preferred source to see more of our stories on Google. This artist's impressions shows the unusual set up of the solar system around the LHS 1903 star (Handout) (Handout/ESA/AFP) ...

Astronomers have identified a strange new kind of exoplanet that challenges how scientists classify worlds beyond our Solar System. The planet, L 98-59 d, appears to contain a vast ocean of molten ...

How does fine dust aggregate into building blocks that ultimately form entire planets like our Earth? A research team led by ...

Astronomers witnessed planets colliding 11,000 light-years away, an event that could shed light on the collision that created Earth's moon.

A seemingly small planetary neighbor may play a larger role in Earth’s climate than previously thought. Mars is only about ...

While its star projector leaves a lot to be desired, the Science Can Solar System Planetary Projector is a fantastic educational tool for kids, with its solar system model, complete with talking ...

Surprised astronomers said Thursday they have discovered a star with planets in a bizarre order that defies scientific expectations -- and suggests these faraway worlds formed in a manner never seen ...