News tagged with dawn
Crater with dark and bright ejecta
(PhysOrg.com) -- This Dawn FC (framing camera) image is centered on a small, young, fresh crater with bright and dark ejecta rays extending from it. This image is a brightness image, which is taken directly ...
Space & Earth / Space Exploration
Jan 27, 2012 |
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Dawn Spacecraft offers first look at giant asteroid’s chemistry
(PhysOrg.com) -- The NASA Dawn spacecraft’s close-up study of the giant asteroid Vesta is offering researchers their first look at the elemental composition of this ancient protoplanet. Vesta is the second most ...
Space & Earth / Space Exploration
Jan 23, 2012 |
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Space mountain produces terrestrial meteorites
When NASA's Dawn spacecraft entered orbit around giant asteroid Vesta in July, scientists fully expected the probe to reveal some surprising sights. But no one expected a 13-mile high mountain, two and a half ...
Space & Earth / Space Exploration
Jan 02, 2012 |
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Dawn sends first low altitude images of Vesta
(PhysOrg.com) -- NASA's Dawn spacecraft has sent back the first images of the giant asteroid Vesta from its low-altitude mapping orbit. The images, obtained by the framing camera, show the stippled and lumpy ...
Space & Earth / Space Exploration
Dec 21, 2011 |
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Dawn spacecraft spirals down to lowest orbit
(PhysOrg.com) -- NASA's Dawn spacecraft successfully maneuvered into its closest orbit around the giant asteroid Vesta today, beginning a new phase of science observations. The spacecraft is now circling Vesta ...
Space & Earth / Space Exploration
Dec 13, 2011 |
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Is Vesta the 'smallest terrestrial planet?'
NASA's Dawn spacecraft spent the last four years voyaging to asteroid Vesta – and may have found a planet.
Space & Earth / Space Exploration
Dec 12, 2011 |
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New NASA dawn visuals show Vesta's 'color palette'
(PhysOrg.com) -- Vesta appears in a splendid rainbow-colored palette in new images obtained by NASA's Dawn spacecraft. The colors, assigned by scientists to show different rock or mineral types, reveal Vesta ...
Space & Earth / Space Exploration
Dec 06, 2011 |
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Dawn soars over asteroid Vesta in 3-D
Glide over the giant asteroid Vesta with NASA's Dawn spacecraft in a new 3-D video. Dawn has been orbiting Vesta since July 15, obtaining high-resolution images of its bumpy, cratered surface and making ...
Space & Earth / Space Exploration
Dec 02, 2011 |
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NASA's Dawn science team presents early science results
(PhysOrg.com) -- Scientists with NASA's Dawn mission are sharing with other scientists and the public their early information about the southern hemisphere of the giant asteroid Vesta. The findings were presented ...
Space & Earth / Space Exploration
Oct 13, 2011 |
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New view of Vesta mountain from Dawn mission
(PhysOrg.com) -- A new image from NASA's Dawn spacecraft shows a mountain three times as high as Mt. Everest, amidst the topography in the south polar region of the giant asteroid Vesta.
Space & Earth / Space Exploration
Oct 11, 2011 |
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Dawn at Vesta: Massive mountains, rough surface, and old-young dichotomy in hemispheres
NASA’s Dawn mission, which has been orbiting Vesta since mid-July, has revealed that the asteroid’s southern hemisphere boasts one of the largest mountains in the Solar System. Other results show ...
Space & Earth / Space Exploration
Oct 04, 2011 |
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Dawn spacecraft begins new Vesta mapping orbit
(PhysOrg.com) -- NASA's Dawn spacecraft has completed a gentle spiral into its new science orbit for an even closer view of the giant asteroid Vesta. Dawn began sending science data on Sept. 29 from this new ...
Space & Earth / Space Exploration
Oct 03, 2011 |
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NASA's Dawn collects a bounty of beauty from Vesta
(PhysOrg.com) -- A new video from NASA's Dawn spacecraft takes us on a flyover journey above the surface of the giant asteroid Vesta.
Space & Earth / Space Exploration
Sep 16, 2011 |
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Dawn beams back asteroid science data
(PhysOrg.com) -- The Dawn spacecraft has completed a graceful spiral into the first of four planned science orbits during the spacecraft's yearlong visit to Vesta. The spacecraft started taking detailed observations ...
Space & Earth / Space Exploration
Aug 12, 2011 |
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Dawn spacecraft begins science orbits of Vesta
NASA's Dawn spacecraft, the first ever to orbit an object in the main asteroid belt, is spiraling towards its first of four intensive science orbits. That initial orbit of the rocky world Vesta begins Aug. ...
Space & Earth / Space Exploration
Aug 02, 2011 |
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Dawn
Dawn is the time that marks the beginning of the twilight before sunrise. It is recognized by the presence of weak sunlight, while the sun itself is still below the horizon. Dawn should not be confused with sunrise, which is the moment when the leading edge of the sun itself appears above the horizon.
The duration of the twilight period between dawn and sunrise varies greatly depending on the observer's latitude, from a few minutes in equatorial regions to many hours in polar regions. Dawn may easily be determined by observing a thread. When the color of a thread can be determined, changing from black to the thread's distinctive color, the 'crack of dawn' has occurred. This same measure of ambient light can be used to determine, conversely, the instant of dusk.
For more information about Dawn, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
