Sentences with phrase «melted by the asteroid»

In the new study, Kunk and Izett dated sanidine from the zone which was melted by the asteroid.

Not exact matches

Almost a billion years later, a large impact by another asteroid melted some crust that promptly froze to form new crust, including a chunk that became Allan Hills A81001.

Marchi's team proposes a novel, more efficient mechanism As the planet was pummeled by primordial asteroids — some larger than 100 kilometers in diameter — impacts would melt large volumes of rock, creating temporary lakes of lava.

Radioactive atoms would have melted the ice, making a sludgy mud that became rock, perhaps aided by gravitational pressure once the asteroid got big enough, or impacts with other objects.

The meteorite is an achondrite, a relatively rare type of space rock that comes from a planet or big asteroid — something large that generated enough internal heat early in its history to melt partially, producing a metallic core surrounded by rock.