If planet X exists, it is likely a gas giant similar to Neptune. NASA/Caltech/R. Hurt (IPAC), CC BY Our solar system is a particularly crowded place. Millions of objects move within it, whether they ...

New observations show that newly formed planets close to a star help shepherd dust and gas to create more planets farther out ...

Data from a now defunct NASA spacecraft has revealed a massive internal reservior of organic material within the second ...

Hubble Space Telescope observations of white dwarf star G238-44 has shown that it is "consuming both rocky-metallic and icy ...

New exhibit to replace Greenbelt Planet Walk with a new trail through Julia Davis Park — but this time, with one less member ...

The dwarf planet Makemake, which chills out in the deep freeze of the outer Solar System, might be home to an ice volcano 1. Makemake is one of many icy worlds that orbit the Sun past Neptune.

In astronomy, what does retrograde mean? And what connection does it have to astrology? We explain how planets move across ...

Pluto has had a tough couple of decades. Formerly the ninth planet in our solar system, Pluto was demoted in 2006 to a “dwarf ...

The star is an early-stage dwarf star, one much dimmer ... as is thought to have taken place in our solar system when some of the giant planets jostled for position. “It hints at fast migration ...

NASA's Dawn mission communicated with Earth for the last time, ending its exploration of Ceres and Vesta, the two largest ...