Space Rock

Fungi, Feces Show Comet Didn’t Kill Ice Age Mammals?

Publication: National Geographic News   Date: June 22, 2010   View Article

Tiny balls of fungus and feces may disprove the theory that a huge space rock exploded over North America about 12,900 years ago, triggering a thousand-year cold snap, according to a new study.

The ancient temperature drop, called the Younger Dryas, has been well documented in the geologic record, including soil and ice core samples.

The cool-down also coincides with the extinction of mammoths and other Ice Age mammals in North America, and it’s thought to have spurred our hunter-gatherer ancestors in the Middle East to adopt an agricultural lifestyle.

“Nanodiamond” Find Supports Comet Impact Extinction Theory

Publication: National Geographic News   Date: January 5, 2009   View Article

The discovery of tiny “nanodiamonds” supports a controversial theory that a catastrophic bombardment of space rocks altered the course of Earth history.

About 12,900 years ago, Earth was escaping the grips of an ice age when something triggered a sudden refreeze.

Huge Impact Crater Uncovered in Canadian Forest

Publication: National Geographic News   Date: November 25, 2008   View Article

About 1,100 years ago a space rock the size of a big tree stump slammed into western Canada, carving an amphitheater-like crater into the ground and littering it with meteorites, a new study found.

Giant Meteor Fireball Explodes over Northwest U.S.

Publication: Giant Meteor Fireball Explodes over Northwest U.S.   Date:   View Article

A meteor zipped across the U.S. Pacific Northwest sky early Tuesday morning before exploding, possibly littering eastern Oregon with marble- to basketball-size space rocks, an expert says.

Comet Wiped Out Early North American Culture, Animals, Study Says

Publication: National Geographic News   Date: May 23, 2007   View Article

A comet exploded over North America about 13,000 years ago, causing a long bout of climate cooling, according to a controversial new theory presented today.

The extraterrestrial impact may help explain massive mammal die-offs and the demise of one of the earliest American cultures.

“Hot” Rocks Found in Icy Comet

Publication: National Geographic News   Date: March 14, 2006   View Article

Comet Wild 2 has spent most of its life in the most frigid reaches of our solar system. But at the comet, NASA’s Stardust spacecraft has found minerals born of intense heat near the sun or other stars, scientists announced yesterday afternoon.

The surprising finding may alter our understanding of how comets form, they said.

Meteorite Impact Reformulated Earth’s Crust, Study Shows

Publication: National Geographic News   Date: January 12, 2006   View Article

About 1.8 billion years ago, a meteorite or comet the size of Mount Everest slammed into what is now Canada.

According to James Mungall, a University of Toronto geologist, the impact turned part of the Earth’s crust inside out and dusted the surface with a rare metal.

© 2008-2010 Collected Writings By John Roach