Social Media Sidebar

Announcement

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

'By far the greatest danger of Artificial Intelligence is that people conclude too early that they understand it'

 

Eliezer Yudkowsky

An alien star system buzzed past the Sun 70,000 years ago

RATE THIS! +23
Posted in Science on 18th Feb, 2015 05:08 PM by AlexMuller

An alien star system once passed through our Solar System just 70,000 years ago, astronomers have announced. No other star is known to have approached this close to us. An international team of researchers says it came five times closer than our current nearest stellar neighbour, Proxima Centauri.

 
The object, a red dwarf known as Scholz's star, cruised through the outer reaches of the Solar System, a region known as the Oort Cloud. Scholz's star was not alone; it was accompanied on its travels by an object known as a brown dwarf. These are essentially failed stars that lacked the necessary mass to get fusion going in their cores. The findings are published in Astrophysical Journal Letters.
 
Observations of the star's trajectory suggest that 70,000 years ago this cosmic infiltrator passed within 0.8 light years of the Sun. By comparison, Proxima Centauri is 4.2 light years away. In the paper, astronomers led by Eric Mamajek at the University of Rochester, New York, say they are 98% certain that Scholz's star travelled through what is known as the "outer Oort Cloud" - a region at the edge of the Solar System filled with trillions of comets a mile or more across.
 
This region is like a spherical shell around the Solar System and may extend out to as much as 100,000 Astronomical Units, or AU (one AU is the distance between the Earth and the Sun). The Oort Cloud is thought to give rise to long-period comets that can swing past the Sun when their orbits are disturbed.

Tags: spacestarplanetastronomysunsolar system

Read original article » Back to category

Comments

Author: Guest
Posted: 2015-02-19
+1
It is amazing what can be found out about stars and their movements and reconstructed over long periods of time- great Reply


 

Recent headlines

  • Posted in Software on 2017-03-30 15:54:22
    Canadian government backs a $150 million AI institute..read more
    Posted in Software on 2017-03-30 15:47:10
    Google Chases General Intelligence With New AI That Has a.....read more
    Posted in Hardware on 2017-03-30 15:39:02
    Copper oxide solar cells on top of regular silicon solar.....read more
    Posted in Hardware on 2017-03-29 09:24:33
    ExoMars: Mars Rover scientists to study Mawrth Vallis.....read more
    Posted in Software on 2017-03-29 09:20:25
    AI to dominate banking, says report..read more
Posted in Business on 2013-10-10 01:33
China is working towards a manned lunar mission in about.....read more
Posted in Business on 2013-10-20 07:17
Spacex says China is their main competitor for commercial.....read more
Posted in Software on 2013-10-20 06:43
Pirate Bay Browser Clocks 1,000,000 Downloads..read more
Posted in Medicine on 2013-10-10 02:10
Google reportedly investing hundreds of millions into new.....read more
Posted in Medicine on 2013-10-14 03:13
Endothelial Cells Can Repair and Regenerate Organs,.....read more
Posted in Science on 01.01.2010
Spacex says China is their main competitor for commercial.....read more
Posted in Science on 01.01.2010
Staring at Your Phone Could Be Making You Short Sighted..read more
Posted in Science on 01.01.2010
Oculus Rift virtual reality headset coming to mobile, but.....read more
Posted in Science on 01.01.2010
China is working towards a manned lunar mission in about.....read more
Posted in Science on 01.01.2010
Delivering drugs via nanoparticles to target mitochondria..read more

Recent Blog Posts

  • Posted by AlexMuller
    Intensive medical treatment can reverse type 2 diabetes..read more
    Posted by AlexMuller
    Daily consumption of tea protects the elderly from cognitive.....read more
    Posted by AlexMuller
    New analysis method of metabolites accurately predicts whether.....read more
    Posted by AlexMuller
    Unproven stem cell 'therapy' blinds three patients at Florida.....read more
    Posted by AlexMuller
    Indigenous South American group has healthiest arteries of all.....read more

Login to your Account

Login to your PlanetTech Account here

Username:
Password:
Remember me
or

Create a New Account

You just need username and password

The following errors occured:
Username:
Email:
Password:
Verify password:
Remember me