A planetary system 116 light-years from Earth has a peculiar pattern. It could flip the script on how planets form, ...

A global team of astronomers, led by the University of Warwick, have used a European Space Agency (ESA) telescope to discover ...

In our Solar System, the inner planets (Mercury to Mars) are rocky, and the outer planets (Jupiter to Neptune) are gaseous.

A closer look at the planets around a star called LHS 1903 may just flip our understanding of how planetary systems form.

Scientists have discovered something that they previously thought wasn’t possible – an ‘inside out’ star system. When you line all the planets in our solar system up, the four closest to the sun are ...

Discover the Kuiper Belt: a frozen ring of dwarf planets and trillions of icy bodies, currently being explored by NASA's New Horizons mission.

Planetary systems in the Milky Way galaxy tend to follow a particular pattern: rocky planets toward the center, closest to ...

Astronomers have found a distant world that challenges planetary formation theory, with a rocky planet where gas giants should be.

Scientists say a nearby red dwarf star hosts a planetary lineup that looks like a mirror image of our own solar system, with ...

By Will Dunham WASHINGTON, Feb 14 (Reuters) - Astronomers have observed a planetary system that challenges current planet formation theories, with a rocky planet that formed beyond the orbits of its ...

For decades, scientists have believed that planetary systems typically form with rocky planets close to their star and gas-rich planets farther away. This discovery questions their knowledge.