Credit & Copyright: F. Tsikalas,
S.T. Gudlaugsson, J.I. Faleide, O. Eldholm
(Geology Dept., Univ. Oslo)
Explanation:
The stark surface of
Earth's moon is pocked with large craters,
records of a history of fierce bombardment by the solar system's
formative debris.
It may be difficult to imagine, but nearby
planet Earth itself has endured a
similar cosmic pounding, though
oceans, weathering, and geological activity
have removed or hidden many of the telltale scars.
For example, this false color image produced from seismic data shows
a recently discovered ringed structure
about 24 miles wide
on the floor of the Barents Sea.
It is most probably the result of the impact,
roughly 150 million years ago,
of a mile or so wide asteroid-like body.
Estimates indicate that
the energy released in the
impact could have
been as high as a million megatons of TNT,
resulting in immense earthquakes and tidal waves.
Drawing on Norse mythology, the crater has been
aptly named
Mjølnir - Thor's hammer.
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NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.
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Publikacii s klyuchevymi slovami:
Earth - impact crater - impact - crater - asteroidy - asteroidnaya opasnost' - Zemlya - zemnaya kora
Publikacii so slovami: Earth - impact crater - impact - crater - asteroidy - asteroidnaya opasnost' - Zemlya - zemnaya kora | |
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