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  • comet Hartley 2

    Hartley 2, Close Up

    This image from the High-Resolution Instrument on NASA's 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 ...

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  • particles swirling in a

    Cometary Flurries

    This zoomed-in image from the High-Resolution Instrument on NASA's EPOXI mission spacecraft shows the particles swirling in a "snow storm" around the nucleus of comet Hartley 2.

    Scientist...

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  • views of the icy particle cloud around comet Hartley 2

    Views of Hartley 2 Nucleus and Inner Coma

    The Medium-Resolution Instrument on NASA's EPOXI mission spacecraft obtained these views of the icy particle cloud around comet Hartley 2. The image on the left is the full image of comet Hartley 2 fo...

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  • Movie showing the motion of some icy particles in the cloud around comet Hartley 2

    Tracking 'Snowballs'

    This movie shows the motion of some icy particles in the cloud around Hartley 2, as seen by NASA's EPOXI mission spacecraft. A star movin...

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  • 3-D image showing the entire nucleus of comet Hartley 2

    Hartley 2 in 3-D

    This 3-D image shows the entire nucleus of Hartley 2 with jets and an icy particle cloud. Circles have been added to highlight the location of individual particles.

    The images used to mak...

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  • Infrared scans of comet Hartley 2 show distributions of carbon dioxide, dust, ice and water vapor

    The Many Faces of Hartley 2

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

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  • comets Tempel 1 and Hartley 2

    Tempel 1 and Hartley 2

    This image shows the nuclei of comets Tempel 1 and Hartley 2, as imaged by NASA's Deep Impact spacecraft, which continued as an extended mission known as EPOXI.

    Tempel 1 is five times lar...

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  • Close-up view of comet Hartley 2

    Closing in on Comet Hartley 2

    This close-up view of comet Hartley 2 was taken as NASA's EPOXI mission approached the comet at 6:58 a.m. PDT (9:58 a.m. EDT). The spacecraft's Medium-Resolution Instrument snapped the picture from a ...

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  • Close-up view of comet Hartley 2

    Almost There at Comet Hartley 2

    This close-up view of comet Hartley 2 was taken as NASA's EPOXI mission approached the comet at 6:59 a.m. PDT (9:59 a.m. EDT). The spacecraft's Medium-Resolution Instrument snapped the picture from a ...

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  • Comet Hartley 2 as seen by NASA's EPOXI mission

    Introducing Comet Hartley 2

    Comet Hartley 2 can be seen in glorious detail in this image from NASA's EPOXI mission. It was taken as the spacecraft flew by around 6:59 a.m. PDT (9:59 a.m. EDT), from a distance of about 700 kilome...

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  • Close-up view of comet Hartley 2

    Slipping By Comet Hartley 2

    This close-up view of comet Hartley 2 was taken at 7:00 a.m. PDT (10 a.m. EDT), after NASA's EPOXI mission flew by. The spacecraft's Medium-Resolution Instrument snapped the picture from a distance of...

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  • Close-up view of comet Hartley 2

    Leaving Comet Hartley 2

    This close-up view of comet Hartley 2 was taken at 7:01 a.m. PDT (10:01 a.m. EDT), after NASA's EPOXI mission flew by. The spacecraft's Medium-Resolution Instrument snapped the picture from a distance...

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  • Small images of the comet, specially filtered to show only carbon dioxide

    Carbon Dioxide Fluctuations in Comet Hartley 2

    The upper panel of this figure shows small images of the comet, specially filtered to show only carbon dioxide, or evaporated dry ice, as a function of time (shown at the bottom). The brightness varie...

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  • This close-up view of comet Hartley 2 was taken by NASA's EPOXI mission during its flyby of the comet on Nov. 4, 2010

    Introducing Comet Hartley 2

    Comet Hartley 2 can be seen in glorious detail in this image from NASA's EPOXI mission. It was taken as the spacecraft flew by around 6:59 a.m. PDT (9:59 a.m. EDT), from a distance of about 700 kilome...

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  • Jets Galore

    Jets Galore

    This enhanced image, one of the closest taken of comet Hartley 2 by NASA's EPOXI mission, shows jets and where they originate from the surface. There are jets outgassing from the sunward side, the nig...

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  • Up Close and Personal with Hartley 2

    Up Close and Personal with Hartley 2

    The image, one of the closest taken of comet Hartley 2 by NASA's EPOXI mission, shows many features across the comet's surface. The length of the comet is equal to the distance between the Capitol bui...

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  • This montage shows the only five comets imaged up close with the EPOXI mission spacecraft.

    Fab Five

    This montage shows the only five comets imaged up close with spacecraft. The comets vary in shape and size. Comet Hartley 2 is by far the smallest and has the most activity in relation to its surface ...

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  • EPOXI Image from Press Conference

    Flying Under Comet Hartley 2

    This image montage shows comet Hartley 2 as NASA's EPOXI mission approached and flew under the comet. The images progress in time clockwise, starting at the top left.

    The image was taken ...

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  • These three pairs of images from NASA's EPOXI mission demonstrate that a dust jet and gaseous carbon dioxide are being released from comet Hartley 2 at the same time, and from the same location on the comet

    Evidence for a First-of-Its-Kind Comet Jet

    These three pairs of images from NASA's EPOXI mission demonstrate that a dust jet and gaseous carbon dioxide are being released from comet Hartley 2 at the same time, and from the same location on the...

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  • This close-up view of comet Hartley 2 was taken by NASA's EPOXI mission during its flyby of the comet on Nov. 4, 2010

    EPOXI Mission's Close-Up Views of Comet Hartley 2

    This close-up view of comet Hartley 2 was taken by NASA's EPOXI mission during its flyby of the comet on Nov. 4, 2010. It was captured by the spacecraft's Medium-Resolution Instrument.

    Im...

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