When Dr. Henry Hsieh entered graduate school, he was interested in comets for a fairly simple reason: they seemed exciting.

On Monday, September 11, 2006, the first episode of Astronomy Cast was promoted across the Internet. Twenty years later, on ...

NASA’s Nancy Grace Roman Space Telescope, scheduled to launch August 30th, is designed to tackle some of the biggest ...

Hands-on Earth and space science workshops for elementary and middle school educators in Tucson and Southern Arizona. Using NASA data, current research, and classroom-ready activities, PSI workshops ...

The Planetary Science Institute is seeking enthusiastic volunteers to join our Docent Program in Southern Arizona. If you enjoy sharing your love of science, working with children and the public, and ...

This archive site provides access to asteroids, dust, planetary satellites, meteorites, and selected other small solar system bodies and laboratory data from the NASA Planetary Data System. CosmoQuest ...

The large block in the photo to the left is known as “Whale Rock”. It was excavated from the interior of Barringer Crater during its formation. Note the person for scale. Until now, most of the ejecta ...

While new chemical species will be added to the database of CRYOCHEM (NH 3, H 2 O, HCN, and CO 2) and its companion FREZCHEM (clathrate hydrates of N 2, C 2 H 6, and C 3 H 8), the solid-phase part of ...

Experience the intersection of art and planetary science through the remarkable works of renowned artist, planetary scientist, and Planetary Science Institute co-founder William K. Hartmann and other ...

Your support makes a difference! As a Planetary Partner, YOU will enable our Scientists and Educators to advance world-class Solar System research and grassroots ...

August 20, 2026, TUCSON, Ariz. – Planetary Science Institute (PSI) has named Samantha (Sam) Riestenberg as its new Science Communications Manager and Public Information Officer, where she will lead ...

Jamie Isen uses the Mars Environmental Chamber, developed by Smith, to grow CO2 ice and to measure the reflectance and spectral properties for variable ice morphologies. Sometimes, the ice is glassy ...