02/04/2014

Team finds regolith of small asteroids formed by thermal fatigue

The centimeter-sized fragments and smaller particles that make up the regolith—the layer of loose, unconsolidated rock and dust—of small asteroids is formed by temperature cycling that breaks down rock in a process called ...

Killing a name of an extinct sea cow species

Sirenians, or sea cows, are a particular group of mammals that superficially resembles whales in having, amongst other features, a streamlined-body and horizontal tail fluke. Though belonging to the so-called marine mammals, ...

One or two? How to decide how many species you have got

It is often difficult to decide whether two animals belong to the same or two distinct species. This can be especially challenging for animals which externally look very similar. In a recent study, published in the open access ...

New study finds 'geologic clock' that helps determine Moon's age

An international team of planetary scientists determined that the Moon formed nearly 100 million years after the start of the solar system (4.470 billion years ago), according to a paper to be published April 3 in Nature. ...

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