Mercury, the smallest planet in the solar system, holds an outsized secret that some researchers believe could reshape how ...

An international team of astronomers has discovered a distant planetary system that challenges long-standing theories of how ...

Six planets will form a cosmic lineup Feb. 28 — here’s why the rare sight may be harder to spot than you think.

For those who enjoy viewing the night sky, a unique opportunity is just around the corner late this month.

From dazzling Jupiter high in the evening sky to elusive Mercury low at sunset, February 2026 offers one of the year's best planetary lineups.

The fourth planet in the system is a rocky world, while the second and third ones are gas planets.

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

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

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

Mercury, Venus, Jupiter, and Saturn—will be visible to the naked eye. Uranus and Neptune, being much farther away, will ...

With a lot of talk about space recently, have you ever wondered which are the hottest planets in the solar system? You'd think the closer you are to the sun, the hotter they must be. Now that's mostly ...