'Rogue planet' is young wanderer

Nov 14, 2012 Full story: BBC News

The proximity of the new rogue planet has allowed astronomers to guess its age: a comparatively young 50-120 million years old.

Full Story

“Geologist [I'm Climate Change]”

Since: Mar 07

formerly Nuneaton

#1 Nov 14, 2012
Nice article.

Never geard of AB doradus before.

The fact that thet have been able to see it indicates that it is hot enough to glow.

The question of how many free floating panets there are out there is quite apt. In a short abount of time most will cool to below detectability, particularly the H & He globules that formed in the early days of the galaxy.
Looks like this is a rather warm verion of the dark matter component of the galaxy.

In the disc the lifespan of an average planet will be relatively short as there is no emitted radiation & stellar wind to counteract condensation of mass from a giant molecular cloud. The result is that the average free floating planet may make only one or 2 orbits in the disc before being dumped on and emerging from the GMC as a brown dwarf or star in similar galactic orbit as it initially hit the GMC with.

Out of the galactic disc, the chances of a free foating planet being dumped on is extremely small as the relative velocities between the free flaoter and the GMC is large even if there is a direct hit, so the amount accreted is minute. The result is a lot of old cold free floaters & brown dwarves zipping about in the galactic halo adding to its stabilising mass.

Have a nice day: Ag

Tell me when this thread is updated:

Subscribe Now Add to my Tracker

Add your comments below

Characters left: 4000

Please note by submitting this form you acknowledge that you have read the Terms of Service and the comment you are posting is in compliance with such terms. Be polite. Inappropriate posts may be removed by the moderator. Send us your feedback.

Astronomy Discussions

Title Updated Last By Comments
Herb York and his Astromart (May '09) 19 hr herb york 37
Four Reasons To Worry About Global Warming Inde... Mon SpaceBlues 8
Speed Of Light May Not Be Constant After All, P... (May '13) Jan 24 nakayama 44
Blood Moon: Bella Thorne, Katy Perry & More Mar... (Apr '14) Jan 24 TheAfroHedgehog 2
Rajnath Singh said the youth should not undermi... Jan 20 Simran Kaur 1
More Jan 20 George 3
We made this for you Clint G Whitman (Aug '13) Jan 15 Guest 4
More from around the web