Recently in the Impact events Category


The extinction of the dinosaurs 66 million years ago is thought to have paved the way for mammals to dominate, but a new study shows that many mammals died off alongside the dinosaurs.

Today's atmosphere likely bears little trace of its primordial self: Geochemical evidence suggests that Earth's atmosphere may have been completely obliterated at least twice since its formation more than 4 billion years ago.

The cratering record on the Earth and Moon shows that our planet has been exposed to high velocity impacts for much or all of its existence. Some of these craters were produced by the impact of long period comets (LPCs).

A new study from Western University explores the possibility that Earth's earliest life forms may have been cultivated by a meteorite impact event.

Astrobiologists have provided new information about how comets and asteroids could have delivered prebiotic chemical compounds to the early Earth.

In 1980, Alvarez and colleagues proposed that, in the transition from the Cretaceous to Paleogene, a large impactor collided with Earth being the cause of the mass extinction occurred at the limit K/Pg.

It is now understood that the accretion of terrestrial planets naturally involves giant collisions, the moon-forming impact being a well known example.

Mapping the Demise of the Dinosaurs

About 65 million years ago, an asteroid or comet crashed into a shallow sea near what is now the Yucatan Peninsula of Mexico.

Oxygen in the atmosphere and ocean rose dramatically about 600 million years ago, coinciding with the first proliferation of animal life. Since then, numerous short lived biotic events -- typically marked by significant climatic perturbations -- took place when oxygen concentrations in the ocean dipped episodically.