Sentences with phrase «impact craters produced»
Recently, geologists suggested these grains may have formed in huge impact craters produced as chunks of rock from space, up to several kilometres in diameter, slammed into a young Earth.
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The chance of a giant impact producing a crater so precisely aligned with Charon is vanishingly slim, Keane says, so he and his team (as well as Nimmo's) went searching for another explanation.
As the drill approaches the crater, 800 meters down, scientists expect to find fewer species of the shell - producing animals that make up the limestone, because life was just recovering from the impact.
The flybys produced superb images of the surfaces of Jupiter's large Galilean satellites, revealing sulphurous volcanoes on Io, ice chasms on Europa, huge ringed impact craters on Callisto, and polygonal dark regions on Ganymede.
Work by B.C. Johnson and T.J. Bowling predicts that only about four of the craters produced by these impacts could persist until today, and geologists have already found three such craters (larger than 170 km in diameter).
The impact that produced the crater was two million times more powerful than the largest nuclear device ever tested, a 58 - megaton hydrogen bomb known as Tsar Bomba, detonated by the Soviet Union in 1961.
A NASA spacecraft charting the topography of the moon in exceptional detail has produced a catalogue of lunar craters that traces billions of years of impact history on the moon.
A crater - producing impact often creates a peak in the center of the crater floor.
The firestorms would have produce an enormous injection of CO2 as well as soot, and the impact crater in partially calcium carbonate rock would have produced direct CO2 from the reduction of that rock, but neither the «nuclear winter» not the subsequent global warming extinguished life.