Stardust comet dust resembles asteroid materials

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Getting into the details: Stardust impact tracks and light gas gun impacts of sulfide in aerogel both display metal beads with sulfide rims indicating that GEMS-like objects in Stardust are generated by impact mixing of comet dust with silica aerogel ...
Getting into the details: Stardust impact tracks and light gas gun impacts of sulfide in aerogel both display metal beads with sulfide rims indicating that GEMS-like objects in Stardust are generated by impact mixing of comet dust with silica aerogel. (left) Stardust GEMS-like material and (right) light gas gun shot GEM-like material. GEMS in cometary IDPs do not contain sulfide-rimmed metal inclusions. [Image credit: Hope Ishii, LLNL]
Contrary to expectations for a small icy body, much of the comet dust returned by the Stardust mission formed very close to the young sun and was altered from the solar system’s early materials.


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Eruptions subside at Sicily's Mount Etna

7 hours ago | User rating: not rated yet
The eruptions that have shaken the Mount Etna volcano on the southern Italian island of Sicily have subsided, experts said Sunday at the Palermo Geophysics and Volcanology Institute.

Oil powered Norway gradually turns into the wind

7 hours ago | User rating: not rated yet
As Norway prepares for a future after oil, the gale-force potential of harvesting wind power off its long coastline has become an increasingly attractive proposition.

Japan aims to cut emissions by 60-80 pct by 2050: reports

8 hours ago | User rating: not rated yet
Japan aims to cut its greenhouse gas emissions by between 60 and 80 percent by 2050, news reports said on Sunday, as part of measures setting out the country's long term environmental goals.

Artificial reef near Miami is cemetery, diving attraction

May 10, 2008 | User rating: not rated yet
(AP) -- About 45 feet beneath the ocean's surface lies a cemetery with gates, pathways, plaques and even benches. The Neptune Memorial Reef, which opened last fall, is seen by its creators as a perfect final ...

Sahara made slow transition from green to desert: study

May 10, 2008 | User rating: not rated yet
The Sahara became the world's biggest hot desert some 2,700 years ago after a very slow fade from green, according to a new study which clashes with the theory that desertification came abruptly.
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