News tagged with dawn
Dawn probe reaches milestone approaching asteroid Vesta
(PhysOrg.com) -- NASA's Dawn spacecraft has reached its official approach phase to the asteroid Vesta and will begin using cameras for the first time to aid navigation for an expected July 16 orbital encounter. ...
Space & Earth / Space Exploration
May 03, 2011 |
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When is an asteroid not an asteroid?
(PhysOrg.com) -- On March 29, 1807, German astronomer Heinrich Wilhelm Olbers spotted Vesta as a pinprick of light in the sky. Two hundred and four years later, as NASA's Dawn spacecraft prepares to begin ...
Space & Earth / Space Exploration
Mar 30, 2011 |
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Glorious Dawn: Sagan, Hawking Sing (w/ Video)
Astronomer and long time science advocate Carl Sagan once said that he was "not very good at singing songs." But on Nov. 9 in Washington D.C., his voice could be heard singing about the wonders of universe -- 13 years after ...
Nov 12, 2009 |
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Cosmologists 'see' the cosmic dawn
(PhysOrg.com) -- The images, produced by scientists at Durham University's Institute for Computational Cosmology, show the "Cosmic Dawn" - the formation of the first big galaxies in the Universe.
Feb 11, 2009 |
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Asteroid collision that spawned Vesta's asteroid family occurred more recently than thought
A team of researchers led by a NASA Lunar Science Institute (NLSI) member based at Southwest Research Institute has discovered evidence that the giant impact crater Rheasilvia on Asteroid (4) Vesta was created ...
Space & Earth / Space Exploration
May 10, 2012 |
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Dawn spacecraft reveals secrets of giant asteroid Vesta
(Phys.org) -- Findings from NASA's Dawn spacecraft reveal new details about the giant asteroid Vesta, including its varied surface composition, sharp temperature changes and clues to its internal structure. ...
Space & Earth / Space Exploration
Apr 26, 2012 |
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Dawn gets extra time to explore Vesta
(Phys.org) -- NASA's Dawn mission has received official confirmation that 40 extra days have been added to its exploration of the giant asteroid Vesta, the second most massive object in the main asteroid belt. ...
Space & Earth / Space Exploration
Apr 19, 2012 |
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Dawn sees new surface features on giant asteroid
(PhysOrg.com) -- NASA's Dawn spacecraft has revealed unexpected details on the surface of the giant asteroid Vesta. New images and data highlight the diversity of Vesta's surface and reveal unusual geologic ...
Space & Earth / Space Exploration
Mar 21, 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 |
4.6 / 5 (8) |
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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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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
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.
