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

The Moon crossed the Sun’s path on February 17, causing what is known as an annular solar eclipse. The Sun was not covered ...

In the medieval period, when Arabic chroniclers recorded eclipses, they usually noted concurrent deaths of rulers. And in Europe, a solar eclipse in 1133 was so closely associated with the 1135 death ...

A newly studied solar system breaks the usual planet pattern, raising fresh questions about how rocky and gas planets form.

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

According to the new data, Jupiter's radius measures 71,488 kilometers (44,421 miles) at its equator, and the planet rises 66 ...

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

Sky This Week is brought to you in part by Celestron. Friday3This dark, moonless Friday the 13th evening is the perfect time ...

Their observations of a faint, cool M-dwarf star called LHS 1903 revealed a system with a rocky world at its outer edge. LHS ...

A rocky exoplanet in the LHS 1903 system defies planet formation models, hinting that gravitational upheaval reshaped the red dwarf’s four worlds.

General relativity helps explain the lack of planets around tight binary stars by driving orbital resonances that eject or destroy close-in worlds. This process naturally creates a “desert” of ...

Between 7 satellite fly-bys and 2 dedicated missions, you'd think our knowledge about Jupiter would be pretty solid, but ...