The enormous visitor to our solar system may have been about 8 times the mass of Jupiter, and come nearly as close to the sun ...

Planets with suns like Wolf 359 are subject to huge blasts of radiation that raise questions about their long-term ...

The organic material found in a few areas on the surface of dwarf planet Ceres is probably of exogenic origin. Impacting ...

Charon is the largest moon of the dwarf planet Pluto, but calling it a moon ... Pluto has a mass of 1.3 x 10 22 kilograms and a diameter of 1,477 miles (2,377 kilometers), whereas Charon has ...

the planet would have to be about 10 AU away, or roughly the distance of Saturn from the sun. The second critical stage is orbital migration. Once the star becomes a white dwarf, an ocean world at ...