As Pluto is the most distant of the nine planets, its 248-year orbit around the Sun is lengthy compared with human timescales. It is also the most eccentric: Pluto's heliocentric distance varies ...

Astronomers have spotted unusual molecular activity in the largest Oort Cloud comet, comet Bernardinelli-Bernstein (C/2014 ...

Recent observations have revealed carbon monoxide venting from the largest comet ever seen, providing clues about its origins ...