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Credit: NASA's Goddard Space Flight Center

Music: \"Electrovoltaic\" and \"Disks in the Sky\" from Killer Tracks.

Watch this video on the NASA Goddard YouTube channel.

Complete transcript available.

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Most of these particles have masses measured in micrograms, similar to a small grain of sand. But with speeds greater than 22,000 mph (36,000 km/h), even micrometeoroids pack a punch. 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.

The mission's primary goal was to test how well the spacecraft could fly in formation with an identical pair of 1.8-inch (46 millimeter) gold-platinum cubes floating inside it. The cubes are test masses intended to be in free fall and responding only to gravity.

The spacecraft serves as a shield to protect the test masses from external forces. When LISA Pathfinder responds to pressure from sunlight and microscopic dust impacts, the spacecraft automatically compensates by firing tiny bursts from its micronewton thrusters to prevent the test masses from being disturbed.

In response to an impact, LISA Pathfinder fires its thrusters to counteract both the minute \"push\" from the strike and any change in the spacecraft's spin. Together, these quantities allow the researchers to determine the impact's location on the spacecraft and reconstruct the micrometeoroid's original trajectory. This may allow the team to identify individual debris streams and perhaps relate them to known asteroids and comets.

Its distant location, sensitivity to low-mass particles, and ability to measure the size and direction of impacting particles make LISA Pathfinder a unique instrument for studying the population of micrometeoroids in the inner solar system. But it's only the beginning.

LISA Pathfinder is managed by ESA and includes contributions from NASA Goddard and NASA's Jet Propulsion Laboratory in Pasadena, California. The mission launched on Dec. 3, 2015, and began orbiting a point called Earth-sun L1, roughly 930,000 miles (1.5 million km) from Earth in the sun's direction, in late January 2016.
LISA stands for Laser Interferometer Space Antenna, a space-based gravitational wave observatory concept that has been studied in great detail by both NASA and ESA. 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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 CenterMusic: \"Vibrating\" (Instrumental) and \"Treacherous Path\" (Instrumental) both from Universal Production MusicWatch this video on the NASA Goddard YouTube channel.Complete transcript available. || LPF_Impacts_still_print.jpg (1024x576) [78.1 KB] || LPF_Impacts_still.jpg (3840x2160) [709.0 KB] || LPF_Impacts_still_searchweb.png (320x180) [54.4 KB] || LPF_Impacts_still_thm.png (80x40) [3.4 KB] || 13332_LPF_Impacts_2_ProRes_1920x1080_2997.mov (1920x1080) [2.6 GB] || 13332_LPF_Impacts_2_Best.mp4 (1920x1080) [525.2 MB] || 13332_LPF_Impacts_2_1080.mp4 (1920x1080) [214.5 MB] || 13332_LPF_Impacts_2_1080.webm (1920x1080) [23.3 MB] || LPF_Impacts_still.tif (3840x2160) [6.4 MB] || LPF_Impacts_SRT_Captions.en_US.srt [4.1 KB] || LPF_Impacts_SRT_Captions.en_US.vtt [4.1 KB] || ", "release_date": "2019-11-18T13:00:00-05:00", "update_date": "2023-05-03T13:45:31.006041-04:00", "main_image": { "id": 392348, "url": "https://svs.gsfc.nasa.gov/vis/a010000/a013300/a013332/LPF_Impacts_still_print.jpg", "filename": "LPF_Impacts_still_print.jpg", "media_type": "Image", "alt_text": "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 CenterMusic: \"Vibrating\" (Instrumental) and \"Treacherous Path\" (Instrumental) both from Universal Production MusicWatch this video on the NASA Goddard YouTube channel.Complete transcript available.", "width": 1024, "height": 576, "pixels": 589824 } }, { "id": 12264, "url": "https://svs.gsfc.nasa.gov/12264/", "page_type": "Produced Video", "title": "LISA Pathfinder Spaceflight Experiment a Rousing Success", "description": "The LISA Pathfinder mission is an ESA-led effort to demonstrate technologies for a future gravitational wave observatory in space. NASA Goddard astrophysicist Ira Thorpe, a member of the team, discusses the mission and its spectacular results so far. 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NASA Goddard astrophysicist Ira Thorpe, a member of the team, discusses the mission and its spectacular results so far. Credit: NASA's Goddard Space Flight CenterWatch this video on the NASA Goddard YouTube channel.Complete transcript available.", "width": 1920, "height": 1080, "pixels": 2073600 } } ], "sources": [], "products": [], "newer_versions": [], "older_versions": [], "alternate_versions": [] }