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This false-color image reveals the scar of a past major impact of a comet or small asteroid on Europa surface. A city-sized impact crater was viewed by NASA Galileo spacecraft.

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This image shows a flash produced in a laboratory by a high-velocity bead slamming into dust. Scientists at Ames Research Center say that the collision between Deep Impact impactor and comet Tempel 1 may have produce a similar flash.

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This image shows the initial ejecta that resulted when NASA Deep Impact probe collided with comet Tempel 1 on July 3, 2005. It was taken by the spacecraft high-resolution camera 13 seconds after impact.

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This composite image shows the three small worlds NASA Stardust spacecraft encountered during its 12 year mission. Stardust performed a flyby of asteroid Annefrank in 2002, Comet Wild in 2004, and Tempel 1 in 2011.

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When NASA Deep Impact probe collided with Tempel 1, a bright, small flash was created, which rapidly expanded above the surface of the comet. This flash lasted for more than a second.

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This image layout depicts changes in the surface of comet Tempel 1, observed first by NASA Deep Impact Mission in 2005 top right and again by NASA Stardust-NExT mission on Feb. 14, 2011 bottom right.

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This image shows comet Tempel 1 approximately 5 minutes before NASA Deep Impact probe smashed into its surface. It was taken by the probe impactor targeting sensor.

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Using NASA Herschel Space Observatory, astronomers have discovered that comet Hartley 2 possesses a ratio of heavy water to light, or normal, water that matches what found in Earth oceans.

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Artist rendering of NASA’s Stardust returning to Earth. Stardust is the first U.S. space mission dedicated to the exploration of a comet, and the first robotic mission designed to return extraterrestrial material from outside the orbit of the Moon.

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This image from the High-Resolution Instrument on NASA EPOXI mission spacecraft shows part of the nucleus of comet Hartley 2. The sun is illuminating the nucleus from the right. A distinct cloud of individual particles is visible.

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This artist concept shows the NASA WISE spacecraft, in its orbit around Earth. In September of 2013, engineers will attempt to bring the mission out of hibernation to hunt for more asteroids and comets in a project called NEOWISE.

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The eastern rim of this unnamed crater in Southern Arabia Terra, imaged by NASA Mars Odyssey, is very degraded, indicating that it an ancient crater that been subjected to erosion and bombardment from impactors such as asteroids and comets.

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This image shows how NASA Deep Impact impactor targeted comet Tempel 1 as the spacecraft made its final approach in the early morning hours of July 4, 2005.

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A large spiral galaxy dominates this view from NASA Wide-field Infrared Survey Explorer. The galaxy, often called the Pinwheel galaxy, was designated object 101 in astronomer Charles Messier catalog of fuzzy things in the sky that are not comets.

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The image depicts the first moments after NASA Deep Impact probe interfaced with comet Tempel 1. The illuminated, and possibly incandescent, debris is expanding from the impact site.

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The impact of an asteroid or comet several hundred million years ago left scars in the landscape that are still visible in this spaceborne radar image of an area in the Sahara Desert of northern Chad.

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This artist concept depicts a comet-like tail of a possible disintegrating super Mercury-size planet candidate as it transits, or crosses, its parent star, named KIC 12557548. The results are based on data from NASA Kepler mission.

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NASA Deep Impact flyby spacecraft shows the flash that occurred when comet Tempel 1 ran over the spacecraft probe taken by the high-resolution camera over a period of 40 seconds.

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This image is from an animation that chronicles the travels of NASA Deep Impact spacecraft, from its launch in January of 2005 to its dramatic impact 172 days later with comet Tempel 1.

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Infrared scans of comet Hartley 2 by NASA EPOXI mission spacecraft show carbon dioxide, dust, and ice being distributed in a similar way and emanating from apparently the same locations on the nucleus.

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This image is a compilation of four images that were taken on June 13, 2005 by NASA Deep Impact. The spacecraft is 18,675,137.9 kilometers 11,604,190 miles away from comet Tempel 1.

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This image obtained by NASA Stardust spacecraft shows a side of the nucleus of comet Tempel 1 that has never been seen before; three terraces of different elevations are visible, with dark, banded scarps, or slopes, separating them.

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This series of images shows the area where NASA Deep Impact probe collided with the surface of comet Tempel 1 in 2005. The view zooms in as the images progress from top left to right, and then bottom left to right.

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This image taken by NASA Spitzer Space Telescope shows the comet Encke riding along its pebbly trail of debris long diagonal line between the orbits of Mars and Jupiter.

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Contenido y metadatos proporcionados por la NASA Image and Video Library.