News tagged with dawn
You're beautiful, Vesta
When UCLA's Christopher T. Russell looks at the images of the protoplanet Vesta produced by NASA's Dawn mission, he talks about beauty as much as he talks about science.
Space & Earth / Space Exploration
May 10, 2012 |
5 / 5 (4) |
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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 |
4.8 / 5 (4) |
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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 |
4.4 / 5 (7) |
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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 |
5 / 5 (4) |
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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 |
4.6 / 5 (9) |
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Space image: Dawn on Vesta
(PhysOrg.com) -- This Dawn FC (framing camera) image shows the sun illuminating the landscape of Vesta during a Vestan ‘sunrise’. When this image was obtained the sun had a low angle relative to ...
Space & Earth / Space Exploration
Feb 23, 2012 |
5 / 5 (2) |
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From Earth's water to cosmic dawn: New tools unveiling astronomical mysteries
(PhysOrg.com) -- Two new and powerful research tools are helping astronomers gain key insights needed to transform our understanding of important processes across the breadth of astrophysics. The Atacama Large ...
Feb 17, 2012 |
4.3 / 5 (4) |
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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 |
4.4 / 5 (5) |
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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 |
5 / 5 (5) |
10
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 |
4.2 / 5 (13) |
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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 |
4.2 / 5 (10) |
3
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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) |
4
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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 |
4.5 / 5 (13) |
9
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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 |
5 / 5 (9) |
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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 |
4.8 / 5 (6) |
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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.
