Universe ID: 13332

How LISA Pathfinder Detected Dozens of 'Comet Crumbs'

Released on November 18, 2019

NASA scientists used data from ESA’s (the European Space Agency’s) LISA Pathfinder mission to detect 54 micrometeoroid impacts on the spacecraft. The research will help scientists learn more about how dust behaves in our planetary system and those around other stars.

Credit: NASA’s Goddard Space Flight Center

Music: "Vibrating" (Instrumental) and "Treacherous Path" (Instrumental) both from Universal Production Music

Watch this video on the NASA Goddard YouTube channel.

Complete transcript available.

LISA Pathfinder, a mission led by ESA (the European Space Agency) that included NASA contributions, successfully demonstrated technologies needed to build a future space-based gravitational wave observatory, a tool for detecting ripples in space-time produced by, among other things, merging black holes. A team of NASA scientists leveraged LISA Pathfinder's record-setting sensitivity for a different purpose much closer to home — mapping microscopic dust shed by comets and asteroids.

Most of these particles, known as micrometeroids, have masses measured in micrograms, similar to a small grain of sand. But at speeds reaching 40,000 mph (64,000 kph), even micrometeoroids pack a punch.

The NASA team, led by Ira Thorpe at NASA's Goddard Space Flight Center in Greenbelt, Maryland, detected 54 impacts during the mission, which lasted from 2015 to 2017. Modeling the strikes allowed the researchers to determine what kinds of objects shed the dust. The findings are broadly consistent with existing ideas of what generates micrometeroids found near Earth. The dusty culprits are mostly short-period comets whose orbits are determined by Jupiter. Comets with longer periods, like Halley’s comet, also contributed dust that LISA Pathfinder sensed

The new measurements could help refine dust models used by researchers in a variety of studies, from understanding the physics of planet formation to estimating impact risks for current and future spacecraft.

Source Material

For More Information

https://www.nasa.gov/feature/goddard/2019/how-lisa-pathfinder-detected-dozens-of-comet-crumbs

Credits

Scott Wiessinger (USRA): Lead Producer
Francis Reddy (University of Maryland College Park): Lead Science Writer
Tom Bridgman (Global Science and Technology, Inc.): Lead Visualizer
Walt Feimer (KBR Wyle Services, LLC): Animator
James Ira Thorpe (NASA/GSFC): Lead Scientist
Scott Wiessinger (USRA): Narrator

Please give credit for this item to:
NASA's Goddard Space Flight Center