Where *isn't* Planet 9?

Astronomers are still looking for a possible giant planet far beyond Neptune.

By Phil Plait 1 week ago

Why does our black hole have a flaring temper?

Sgr A*, our supermassive black hole, keeps flaring, and we could soon find out what sets it off.

By Elizabeth Rayne 1 week ago

The case of the Centaurs that didn't bark in the night

By Phil Plait 2 weeks ago

Tiny grains of alien material in meteorites point to origins in other stars

By Phil Plait 4 weeks ago

Asteroids, the Universe, and Everything: Meet 42 space rocks

By Phil Plait 4 weeks ago

Is there a ghost planet hiding in the shadows behind Neptune?

By Elizabeth Rayne 1 month ago

Kleopatra may be a dumbbell-shaped metallic rubble pile

By Phil Plait 2 months ago

Where is all the missing planetary junk in the solar system?

By Elizabeth Rayne 2 months ago

Way too many stars like the Sun have eaten their planets, but what gives them these cravings?

By Elizabeth Rayne 2 months ago

What put all the radioactive stuff in our solar system? Dead, exploded stars

By Elizabeth Rayne 2 months ago