Feeds

Dino-killing asteroid traced back 160m years

T-Rex was history before he was even born

Intelligent flash storage arrays

The dinosaur-busting asteroid that slammed into Earth some 65 million years ago has been traced back to a collision between two monster chunks of rock 160 million years ago, out in the main asteroid belt.

A smashing time. Art by Don Davis

According to researchers at the Southwest research Institute (SwRI) and the University of Prague, the dino-killer most likely began its journey to Earth before T-Rex had even evolved, when a relatively small (60 kilometres) asteroid crashed into a much bigger 170 kilometre monster rock.

The team says this impact produced what is now known as the Baptistina asteroid family, a cluster of asteroid fragments with similar orbits. There were originally 300 bodies larger than 10 kilometres, and 140,000 chunks larger than a kilometre.

Over time, the asteroids drifted out of the main asteroid belt, spurred on by thermal variations produced when they absorbed sunlight and re-radiated the energy away as heat.

"By carefully modelling these effects and the distance travelled by different-sized fragments from the location of the original collision, we determined that the Baptistina break up took place 160 million years ago, give or take 20 million years," Dr. William Bottke, co-author of the research explains.

Eventually, about 20 per cent of the original family made their escape from the asteroid belt, and headed towards the Earth/moon system. Of these, some two per cent actually landed on Earth, fewer still hit the moon.

The team says the family is likely to have spawned the rock that created the moon's distinctive Tycho impact, and the monster rock that created the 180-kilometre Chicxulub crater off the coast of the Yucatan 65 million years ago.

Fellow researcher Dr. David Nesvorny elaborated: "The Baptistina bombardment produced a prolonged surge in the impact flux that peaked roughly 100 million years ago. This matches up pretty well with what is known about the impact record."

The team adds that we are now at the tail end of the Baptistina bombardment. "Our simulations suggest that about 20 percent of the present-day, near-Earth asteroid population can be traced back to the Baptistina family," Bottke said. ®

Providing a secure and efficient Helpdesk

More from The Register

next story
SECRET U.S. 'SPACE WARPLANE' set to return from SPY MISSION
Robot minishuttle X-37B returns after almost 2 years in orbit
LOHAN crash lands on CNN
Overflies Die Welt en route to lively US news vid
You can crunch it all you like, but the answer is NOT always in the data
Hear that, 'data journalists'? Our analytics prof holds forth
Experts brand LOHAN's squeaky-clean box
Phytosanitary treatment renders Vulture 2 crate fit for export
No sail: NASA spikes Sunjammer
'Solar sail' demonstrator project binned
Carry On Cosmonaut: Willful Child is a poor taste Star Trek parody
Cringeworthy, crude and crass jokes abound in Steven Erikson’s sci-fi debut
Origins of SEXUAL INTERCOURSE fished out of SCOTTISH LAKE
Fossil find proves it first happened 385 million years ago
Human spacecraft dodge COMET CHUNKS pelting off Mars
Odyssey orbiter yet to report, though - comet's trailing trash poses new threat
prev story

Whitepapers

Forging a new future with identity relationship management
Learn about ForgeRock's next generation IRM platform and how it is designed to empower CEOS's and enterprises to engage with consumers.
Cloud and hybrid-cloud data protection for VMware
Learn how quick and easy it is to configure backups and perform restores for VMware environments.
Three 1TB solid state scorchers up for grabs
Big SSDs can be expensive but think big and think free because you could be the lucky winner of one of three 1TB Samsung SSD 840 EVO drives that we’re giving away worth over £300 apiece.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.