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Wednesday, July 16, 2014

Back in the Day: Jupiter Gets Hit By A Comet

Brown spots mark the impact sites of Comet Shoemaker Levy-9 after its fragments collided with Jupiter, between July 16-22, 1994.
NASA / Hubble Space Telescope Comet Team

20 years ago this month, I enthusiastically went outside everyday (for seven days) to retrieve the L.A. Times newspaper from my front yard to see awesome photos of this celestial occurrence on the front page. Of course, the press release posted with this entry will tell you why this event was so cool; the summer of 1994 was also the period of time as I prepared to enter the 9th grade. Yup, what better way to get ready for my first year in high school than to geek (or nerd) out over an amazing scientific opportunity instead of looking good for hot freshman girls on the first day of class. Um, anyways... Read on.

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Looking Back at the Jupiter Crash 20 Years Later (Press Release - July 15)

Twenty years ago, human and robotic eyes observed the first recorded impact between cosmic bodies in the solar system, as fragments of comet Shoemaker-Levy 9 slammed into the atmosphere of Jupiter. Between July 16 and July 22, 1994, space- and Earth-based assets managed by NASA's Jet Propulsion Laboratory in Pasadena, California, joined an armada of other NASA and international telescopes, straining to get a glimpse of the historic event:

- NASA's Galileo spacecraft, still a year-and-a-half out from its arrival at Jupiter, had a unique view of fireballs that erupted from Jupiter's southern hemisphere as the comet fragments struck.

- NASA's Hubble Space Telescope, using the JPL-developed and -built Wide Field and Planetary Camera 2, observed the comet and the impact scars it left on Jupiter.

- The giant radio telescopes of NASA's Deep Space Network -- which perform radio and radar astronomy research in addition to their communications functions -- were tasked with observing radio emissions from Jupiter's radiation belt, looking for disturbances caused by comet dust.

- NASA's Voyager 2 spacecraft, then about 3.7 billion miles (6 billion kilometers) from Jupiter, observed the impacts with its ultraviolet spectrometer and a planetary radio astronomy instrument.

- The Ulysses spacecraft also made observations during the comet impact from about 500 million miles (800 million kilometers) away. Ulysses observed radio transmissions from Jupiter with its combined radio wave and plasma wave instrument.

The work of scientists in studying the Shoemaker-Levy 9 impact raised awareness about the potential for asteroid impacts on Earth and the need for predicting them ahead of time, important factors in the formation of NASA's Near-Earth Object Program Office. The NEO Program Office coordinates NASA-sponsored efforts to detect, track and characterize potentially hazardous asteroids and comets that could approach Earth.

The Galileo mission was managed by NASA's Jet Propulsion Laboratory in Pasadena, California, for the agency's Science Mission Directorate. JPL also manages the Voyager mission and the Deep Space Network for NASA. NASA's Near-Earth Object Program at NASA Headquarters, Washington, manages and funds the search, study and monitoring of asteroids and comets whose orbits periodically bring them close to Earth. JPL manages the Near-Earth Object Program Office for NASA's Science Mission Directorate in Washington. JPL is a division of the California Institute of Technology, Pasadena.

Source: Jet Propulsion Laboratory

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NASA's Galileo spacecraft took this shot of fragment W, which was once part of Comet Shoemaker Levy-9, striking Jupiter on July 22, 1994.
NASA / JPL

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