Centaurs are mysterious icy small-bodies that are neither purely comets nor purely inactive asteroids, but they all orbit the Sun between Jupiter and Neptune in unstable orbits. They’re relatively ...

PSI is a nonprofit 501(c)(3) corporation, and an Affirmative Action/Equal Opportunity Employer, including disability/veterans.

Ancient river valleys carved less than 3 billion years ago during Mars’ Early Amazonian Epoch dissect the flanks of the Martian volcano Alba Mons. To understand Mars’ more recent geologic and ...

May 27, 2025, TUCSON, Ariz. – In the cold, dark outskirts of planetary systems far beyond the reach of the known planets, mysterious gas giants and planetary masses orbit their stars – sometimes ...

Religion and science can sometimes feel at odds, to the chagrin of Grace Wolf-Chase, a Planetary Science Institute senior scientist and senior education and communication specialist who is also a ...

PSI is a nonprofit 501(c)(3) corporation, and an Affirmative Action/Equal Opportunity Employer, including disability/veterans.

PSI is a nonprofit 501(c)(3) corporation, and an Affirmative Action/Equal Opportunity Employer, including disability/veterans.

Six Planetary Science Institute members traveled to Capitol Hill on the evening of Monday, May 19 to attend the Congressional Planetary Science Caucus kick-off reception. They set up a PSI table to ...