Small Worlds

Image Impact

Deep Impact

The Deep Impact mission sent a probe into the path of comet Tempel 1 with spectacular results, revealing clues about the comet’s internal composition and structure.


Deep Impact

67 seconds after impact


Deep impact

Ice Patches on Tempel 1
First ice found on a comet’s surface

photo of Mike A’Hearn


Mike A’Hearn Principal Investigator of the Deep Impact and EPOXI missions

Mike is a professor of astronomy at the University of Maryland. His distinguished career
includes many contributions to the field of cometary science, including developing observational techniques to study their structure and composition.

+ Reflections on “Bulls-Eye” and more about the Deep Impact Mission (MP3, 3:22 min.)




photo of Lucy McFadden

Lucy McFadden Co-Investigator on the Deep Impact, EPOXI, and Dawn missions

Lucy is a planetary scientist and the chief of Higher Education and University Programs at NASA’s Goddard Space Flight Center and Co-Investigator on the Dawn mission to asteroids Vesta and Ceres. Previously, she was a research professor at the University of Maryland. Lucy also directed the Education and Public Outreach programs for Discovery’s Deep Impact, EPOXI and Dawn missions.

+ Reflections on “Bulls-Eye” (MP3, 2:25 min.)
+ Reflections on “Ice Patches on Comet Tempel 1”(MP3, 1:22 min.)




Tempel 1

Quiet Before the Storm
Tempel 1 Five Minutes before Impact


Comet Wild 2

Incredible Features on the Nucleus
Comet Wild 2 as viewed by Stardust

photo of Don Yeomans

Don Yeomans Co-investigator on the Deep Impact and EPOXI missions

Don is a Senior Research Scientist at the Jet Propulsion Laboratory and manages NASA's
Near-Earth Object Program, coordinating efforts to detect, track and characterize potentially
hazardous asteroids and comets that could approach the Earth.

+ Reflections on “Quiet Before the Storm” (MP3, 2:15 min.)
+ Reflections on “Incredible Features on the Nucleus” (MP3, 1:16 min.)