Hundreds of Moon-sized worlds may orbit the Sun far beyond Neptune, sculpting the geometry of the outer Solar System. So far, astronomers have spotted only a handful of these objects — but if ...

Instead, the sun stretches 0.5° across, so even during total solar eclipses, some of its light passes either above or below the moon, creating a less-dense shadow called the penumbra. Only where the ...

This invisible boundary, located about 100 astronomical units (AU) from the Sun (one AU is the distance from Earth to the Sun ...

A tiny meteorite is rewriting what scientists thought they knew about the origins of our solar system.

Astronomers have discovered a rare in-sync solar system with six planets moving like a grand cosmic orchestra, untouched by outside forces since their birth billions of years ago. The find ...

Astronomers have picked up evidence of an Earth-sized world, distinct from the previously hypothesised Planet Nine and Planet ...

Astronomers have discovered the earliest seeds of planets forming around HOPS-315, a baby star located 1,300 light-years away.