From asteroids the size of football stadiums to nuclear war and man-made pandemics, it can seem as if humankind is in ...

I/ATLAS might be over 7 billion years old, a new study reports, which would make it the oldest comet known. But experts caution we need more data.

Several planets stand still in the sky, Titan’s shadow transits Saturn, and Venus gives Taurus a second eye in the sky this ...

When most people think of our Solar System, they think of the 8 planets officially recognized by the International Astronomical Union (IAU). But what if I told you there are at least 40 planets, and ...

Just the third-ever confirmed interstellar object has been detected in our solar system. Here's what we know. (Spoiler: It's ...

Astronomers tracking an interstellar object flying through the solar system think it comes from a star at least 8 billion ...

Readers can visit the eight planets of the solar system in this rhyming counting tour. The rounded, plastic planets—from Mercury to Neptune—poke through cardboard pages (but don't actually ...

Ancient meteorite reveals a protoplanet formed in the outer Solar System earlier than thought, reshaping planet formation ...

Astronomers have spotted centimeter-sized “pebbles” swirling around two infant stars 450 light-years away, revealing the raw ...

In the past two years, without much notice, solar power has begun to truly transform the world’s energy system.

Upgraded ALMA images expose hidden rings and spirals around baby stars, indicating planets begin taking shape mere cosmic ...

With the tariffs set to kick in now on Aug. 1, the latest move by the White House amounts to essentially a four-week ...