Sentences with phrase «known impact craters»

The two decided to search for fullerenes near known impact craters.

Not exact matches

By examining the craters that formed on top of it, researchers estimate that Rembrandt formed in an impact some 3.9 billion years ago, near the end of a barrage of impacts in the inner solar system known as the Late Heavy Bombardment.

A massive impact on the Moon about 4 billion years ago left a 2,500 - mile crater, among the largest known craters in the solar system.

The impact melted the surface that it hit and gouged out a 77 - kilometre - wide basin known as King crater.

Ever since NASA's Magellan probe mapped Venus's surface in detail in the early 1990s, scientists have known that the landscape there is remarkably unblemished by impact craters but rich in apparently dormant volcanoes.

Approximately 150 impact craters are known on Earth, but most are severely eroded or hidden beneath tonnes of rock.

Impact craters reveal one of the most spectacular geologic process known to human beings.

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.

The Sudbury structure is distinctive among the known terrestrial impact craters.

The spherules, known as microtektites, are droplets of molten rock that were melted and thrown out of the impact crater by the energy of the projectile, or condensed from rock that was vaporized upon impact.

The solution was to compare the amount of confirmed craters of different sizes, calculate the expected frequency of the impacts on the basis of the known probabilities, and combine this information to infer the rates of erosion.

The impact that formed a large basin known as Orientale in the western area of the moon's near side, which the group investigated in detail, obliterated all prior craters within the basin itself, an area of nearly 700,000 square kilometers.

This view of 1,000 - mile - wide Caloris basin — among the largest known asteroid impacts in the solar system — shows how lava (orange) filled the blast site before new craters excavated the original basin (purple).

Astronomers have long known that the craters visible on moons were caused by the impact of other bodies, billions of years ago.

They were understandably very happy to see that the chemistry of the zircons from the Canadian impact crater matched the oldest crystals known to man.»

«The red arcs must be geologically young because they cut across older features like impact craters, but we don't know their age in years,» Paul Helfenstein, a Cassini imaging scientist at Cornell University, Ithaca, in New York, said in the statement.

Many people thought the very ancient zircon crystals couldn't have formed in impact craters, but we now know they could have.»