A decade ago this week, NASA’s New Horizons mission snapped the first-ever close-up image of Pluto. The awe-inspiring portrait of the dwarf planet featured a heart-shaped plane of frozen nitrogen and ...

July 15, 2025, TUCSON, Ariz. – Orbiting in the outskirts of the Solar System is a mysterious object moving in rhythm with Neptune, according to a new paper published in the Planetary Science Journal.

July 15, 2025, TUCSON, Ariz. – The United Nations General Assembly agreed in 2021 to create International Moon Day, which celebrates the anniversary of the first landing by humans on the Moon on 20 ...

Field Guide to the Santa Fe impact structure (from 2017 Annual Meeting of the Meteoritical Society in Santa Fe, NM) Depositional contacts of loess and basalt as an analog for dust on Mars… ...

Stars that pass by our Solar System have altered the long-term orbital evolution of planets, including Earth, and by extension modified our climate.

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 ...

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 ...

January 15, 2024, Tucson, Ariz. – Using impact craters as a dating tool, Planetary Science Institute Research Scientist Alexander Morgan has determined maximum timescales for the formation of Martian ...

June 6, 2024 Tucson, Ariz. – Mars polar ice caps were one of the first Earth-like characteristics identified on Mars. Since the development of film in the 19th Century, researchers expected to see ...

Mishal K T was awarded the 2025 Pierazzo International Student Travel Award at the Lunar and Planetary Science Conference at The Woodlands, Texas, along with a check for $2,000 from PSI Director and ...

Three PSI scientists were honored by NASA for their work on a mission that will study the availability of ice on Mars, which could help select the target for future human exploration.