By: Tariq Malik
Published: 03/21/2012 11:16 PM EDT on SPACE.com
A NASA spacecraft orbiting the huge asteroid Vesta has snapped amazing new photos of the colossal space rock, images that reveal strange features never-before-seen on an asteroid, scientists say.
The new photos of Vesta from NASA's Dawn spacecraft highlight odd, shiny spots that are nearly twice as bright as other parts of the asteroid — suggesting it is original material left over from the space rock's birth 4 billion years ago, NASA officials said today (March 21).
With a width of about 330 miles (530 km), asteroid Vesta is one of the largest and brightest objects in the main asteroid belt between the orbits of Mars and Jupiter. NASA's Dawn probe has been orbiting Vesta since 2011 to study the space rock in unprecedented detail.
"Our analysis finds this bright material originates from Vesta and has undergone little change since the formation of Vesta over 4 billion years ago," said Jian-Yang Li, a Dawn participating scientist at the University of Maryland, College Park, in a statement. "We're eager to learn more about what minerals make up this material and how the present Vesta surface came to be."
Asteroid Vesta unveiled
Li and his colleagues unveiled Dawn's new views of Vesta today at the 43rd Lunar and Planetary Science Conference in The Woodlands, Texas.
The photos show surprisingly bright spots all over Vesta, with the most predominant ones located inside or around the asteroid's many craters. The bright areas range from large spots (around several hundred feet across) to simply huge, with some stretching across 10 miles (16 kilometers) of terrain. [Video: Vesta — Asteroid or Dwarf Planet?]
"Dawn's ambitious exploration of Vesta has been going beautifully," said Marc Rayman, Dawn chief engineer at NASA's Jet Propulsion Laboratory in Pasadena, Calif., which oversees the mission. "As we continue to gather a bounty of data, it is thrilling to reveal fascinating alien landscapes."
Dawn mission scientists suspect the bright patches on Vesta were exposed during violent collisions with other space rocks. These impacts may have spread the bright material across the asteroid and mixed it together with darker material on Vesta's surface, researchers said.
Astronomers have known about variations in Vesta's brightness for some time. Photos taken by the Hubble Space Telescope before Dawn arrived at the asteroid also revealed the bright patches.(Story continues below.)
GALLERY: VIEWS OF VESTA FROM THE DAWN SPACECRAFT
This artist's concept shows NASA's Dawn spacecraft orbiting the giant asteroid Vesta. The depiction of Vesta is based on images obtained by Dawn's framing cameras. Image: NASA/JPL-Caltech/JAXA/ESA
NASA's Dawn spacecraft obtained this image of the giant asteroid Vesta with its framing camera on July 24, 2011. Scientists are studying image like these to better understand the different materials on the surface. Image: NASA/JPL-Caltech/JAXA/ESA
This image, made from data obtained by NASA's Dawn spacecraft, shows a perspective view of a layered young crater in the Rheasilvia basin at Vesta. (It is the same crater as Fig. 3.) It was created from laying images from the mission's low-altitude mapping orbit (an average of 130 miles or 210 kilometers above the surface) atop a digital terrain model. Image: NASA/JPL-Caltech/JAXA/ESA
These images were obtained by the Dawn spacecraft on July 23, 2011. The bottom two images are false-color, where different colors represent visible and infrared light wavelengths. Image: NASA/JPL-Caltech/JAXA/ESA
NASA's Dawn spacecraft obtained this image of the giant asteroid Vesta with its framing camera on July 24, 2011. It was taken from a distance of about 3,200 miles (5,200 kilometers). Dawn entered orbit around Vesta on July 15, and will spend a year orbiting the body. After that, the next stop on its itinerary will be an encounter with the dwarf planet Ceres. Image: NASA/JPL-Caltech/JAXA/ESA
This false-color map of the giant asteroid Vesta was created from stereo images obtained by the framing camera aboard NASA's Dawn spacecraft. The image shows the elevation of surface structures with a horizontal resolution of about 750 meters per pixel. Image: NASA/JPL-Caltech/JAXA/ESA
This composite image shows the comparative sizes of nine asteroids. Up until now, Lutetia, with a diameter of 81 miles (130 kilometers), was the largest asteroid visited by a spacecraft, which occurred during a flyby. Image: NASA/JPL-Caltech/JAXA/ESA
This image, one of the first obtained by NASA's Dawn spacecraft in its low altitude mapping orbit, shows part of the rim of a fresh crater on the giant asteroid Vesta. The terrain shown here is located in an area known as the Heavily Cratered Terrain in the northern hemisphere. Image: NASA/JPL-Caltech/JAXA/ESA
This image obtained by the framing camera on NASA's Dawn spacecraft shows the south pole of the giant asteroid Vesta. Image: NASA/JPL-Caltech/JAXA/ESA
Never-before seen asteroid melt
But only the close-up photos from the Dawn probe have revealed the surprising variety of dark blotches on Vesta, which appear as dark gray, brown or reddish blemishes, NASA officials said.
In some views, these darker spots are small deposits near impact craters, while in other photos they appear in larger concentrations. These darker spots on Vesta may also be the result of collisions on the asteroid, researchers said.
Slow carbon-rich asteroids may have created some of the smaller dark material deposits without carving out a big crater. Meanwhile, faster objects may have potentially slammed into Vesta so hard they melted the big asteroid's crust, which could have also created the dark spots.
"Some of these past collisions were so intense they melted the surface," said Brett Denevi, a Dawn participating scientist at the Johns Hopkins University Applied Physics Laboratory in Laurel, Md. "Dawn's ability to image the melt marks a unique find. Melting events like these were suspected, but never before seen on an asteroid."
NASA launched the $466 million Dawn spacecraft in 2007 and Vesta is only the first stop of the spacecraft's two-asteroid tour. Dawn arrived at Vesta in July 2011 and is expected to spend about a year there before heading off to its next target — the even larger asteroid Ceres, which is also classified as a dwarf planet.
Dawn is expected to arrive at Ceres in February 2015.
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