(This was first published as an Op-Ed in the Arizona Daily Star and is the opinion of PSI director and CEO Amanda Hendrix.). When I was a third grader in 1976, I was struck by a Viking 2 image taken ...

The march of the planets around the Sun may seem interminable, but new research suggests that the likelihood of another star in our galaxy passing by and disrupting our Solar System is slightly higher ...

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

PSI Research Scientist Kirby Runyon traveled from Washington, D.C. to Flagstaff, Arizona to participate in a cratering workshop from July 14-15 called ICAARUS, short for Impact Cratering and ...

Sept. 16, 2024, Tucson, Ariz. – A new analysis of maps of the near and far sides of the Moon shows that there are multiple sources of water and hydroxyl in the sunlit rocks and soils, including ...

Feb. 14, 2024, Tucson, Ariz. – Stars that pass by our Solar System have altered the long-term orbital evolution of planets, including Earth, and by extension modified our climate. “Perturbations – a ...

Oct. 28, 2024, TUCSON, Ariz. – The Moon and Mars are pocked with giant impact craters acquired very long ago, while there appears to be a dearth of them on Earth and Venus. Time may have healed many ...

A mysterious object discovered in the main asteroid belt in 2021 was determined to be a main-belt comet by Planetary Science Institute Senior Scientist Henry Hsieh, Scott Sheppard of the Carnegie ...

Nov. 1, 2024, TUCSON, Ariz. – On a cold, ancient Mars, rivers flowed and a lake the size of the Mediterranean Sea swelled under the protection of thick ice ceilings, according to new research ...

April 15, 2024, Tucson, Ariz. – Saturn’s moon Mimas could have grown a huge underground ocean as its orbital eccentricity decreased to its present value and caused its icy shell to melt and thin. “In ...

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 ...

A new geologic map of a portion of Oriental basin where one pixel on the photographic basemap is about the size of a football field (100 m). The stars are locations where future missions could sample ...