Social Media Sidebar


Please sign up, comment on articles and bring your friends!

Current poll

PlanetTech is asking:

What do you think about our new web site?

Love it, indeed
Really good solution
Same as old one
The old one was better
This is a new option

Quote of the day

When seen through the lens of technology, few resources are truly scarce; they’re mainly inaccessible. 


Peter Diamandis

Comets, not asteroids, pose the real danger to Earth from space

Posted in Science on 26th Dec, 2015 10:00 PM by AlexMuller

Earth could be in serious danger due to outer space objects, but it isn’t asteroids that we should be panicking about, experts from Armagh Observatory and the University of Buckingham warn in a new Astronomy and Geophysics study, it’s comets that pose the real danger.

Specifically, the threat comes in the form of giant comets known as centaurs, which the authors explained are typically up to 100 km large and more massive than all of the near-Earth asteroids discovered thus far combined. These centaurs travel along unstable orbits that cross the paths of the outer planets, whose gravitational fields could deflect them towards our planet.
According reports, their calculations indicate that such a phenomenon occurs once every 40,000 to 100,000 years. As a centaur traveled closer to Earth, it would disintegrate in the atmosphere, leaving behind fragments likely to impact with the planet’s surface. Recent research has revealed that there are hundreds of these comets in the outer planetary system.
“The disintegration of such giant comets would produce intermittent but prolonged periods of bombardment lasting up to 100,000 years,” the study authors wrote, adding that such an event may be “inevitable” and that the “assessment of the extraterrestrial impact risk based solely on near-Earth asteroid counts, underestimates its nature and magnitude.”
Such an event could be worse than a nuclear winter, the authors claim. As team members Professors Bill Napier and Duncan Steel m the University of Buckingham and Professor Mark Bailey and Dr. David Asher from Armagh Observatory said in a statement, there was a centaur arrival that took place about 30,000 years ago. Debris from the massive comet was likely scattered throughout the inner solar system.
Thanks to the research of geologists and paleontologists, the scientists were also able to identify several episodes of environmental upheaval that occurred between 10,800 BCE and 2,300 BCE that were said to be consistent with the behavior of these comets. They believe that some of the planet’s most extreme mass extinction events could actually be linked to centaurs.
“In the last three decades we have invested a lot of effort in tracking and analyzing the risk of a collision between the Earth and an asteroid,” Professor Napier explained. “Our work suggests we need to look beyond our immediate neighborhood too, and look out beyond the orbit of Jupiter to find centaurs. If we are right, then these distant comets could be a serious hazard.”
As the team told AFP, no such event is “known to be imminent,” though they cautioned that the behavior of comets was somewhat unpredictable. Were something like this to happen, however, they said that it could inject “a mass of dust and smoke comparable to that assumed in nuclear winter studies” into the atmosphere. “Thus, in terms of magnitude, its ranking among natural existential risks appears to be high.”

Tags: spacecometEarthasteroidplanet

Read original article » Back to category


Author: Guest
Posted: 2015-12-27
Asteroids also could be a problem and efforts have been made to device machinery to stop their potentially devastating impact on earth. We are now warned about comets, but could we do anything about them? Reply


Recent headlines

  • Posted in Business on 2018-01-20 21:56:03
    This Week’s Awesome Stories From Around the more
    Posted in Business on 2018-01-20 21:47:47
    Solar developer proposes new uses for old more
    Posted in Software on 2018-01-20 21:40:09
    AI Is Better at Compromise Than Humans, Finds New more
    Posted in Business on 2018-01-19 20:55:12
    Apple’s 'Everyone Can Code' program expands more
    Posted in Online on 2018-01-19 20:48:40
    U.S. Senate passes bill to renew warrantless more
Posted in Business on 2013-10-10 01:33
China is working towards a manned lunar mission in more
Posted in Business on 2013-10-20 07:17
Spacex says China is their main competitor for more
Posted in Software on 2013-10-20 06:43
Pirate Bay Browser Clocks 1,000,000 more
Posted in Medicine on 2013-10-10 02:10
Google reportedly investing hundreds of millions into more
Posted in Medicine on 2013-10-14 03:13
Endothelial Cells Can Repair and Regenerate Organs, more
Posted in Science on 01.01.2010
Spacex says China is their main competitor for more
Posted in Science on 01.01.2010
Staring at Your Phone Could Be Making You Short more
Posted in Science on 01.01.2010
Oculus Rift virtual reality headset coming to mobile, more
Posted in Science on 01.01.2010
China is working towards a manned lunar mission in more
Posted in Science on 01.01.2010
Delivering drugs via nanoparticles to target more

Recent Blog Posts

  • Posted by AlexMuller
    Martian landscapes formed from sand 'levitating' on a more
    Posted by AlexMuller
    Scientists detect comets outside our solar more
    Posted by AlexMuller
    Advanced artificial limbs mapped in the more
    Posted by AlexMuller
    Bacteria have a sense of more
    Posted by AlexMuller
    Recurrent brain cancer: New hope with phase 1 clinical more

Login to your Account

Login to your PlanetTech Account here

Remember me

Create a New Account

You just need username and password

The following errors occured:
Verify password:
Remember me