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| Bright Spots on Dwarf Planet Can |
| Bright Spots on Dwarf Planet Can Be Active Ice: NASA
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| UNITED STATES OF AMERICA
, 18-March-2015
8:1:46 AM |
| A pair of bright spots that glimmer inside an impact crater on the asteroid Ceres could be some kind of icy plume, new images from NASA's Dawn spacecraft have revealed.
The images show the spots at changing angles as the asteroid rotates in and out of sunlight.
"What is amazing is that you can see the feature while the rim is still in the line of sight," said lead researcher Andreas Nathues, planetary scientist at the Max Planck Institute for Solar System Research in Gottingen, Germany.
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The pictures reveal the spots even when they are near the edge of Ceres, when the sides of the impact crater would normally block the view of anything confined to the bottom.
The fact that something is visible at all suggests that the feature must rise relatively high above the surface.
At dawn on Ceres, the spots appear bright. By dusk, they seem to fade, said a report in the scientific journal Nature.
"That could mean sunlight plays an important role as, for instance, by heating up ice just beneath the surface and causing it to blast off in some kind of plume or other feature," the scientists said.
Ceres is believed to be made of at least one-quarter ice, more so than most asteroids.
Dawn's goal is to figure out where that ice resides and what role it plays in shaping the asteroid's surface.
"The big question is whether Ceres has an active region or more than one," Nathues noted.
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