Re: What if hypervelocity star came near Sun?

"tracy" <tracyj23@xxxxxxxxx> ha scritto nel messaggio
news:1164258720.441994.178390@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
According to this article, the mysterious super-high speed stars are
more numerous and fastest than previously though. What if one of these
"hypervelocity" stars came through Sun's neighborhood? How dangerous
it could be for life on Earth?

What would be safe distance a star moving at about 700 - 1000 km/s
could get near Sun without disrupting the planetary system?

http://space.newscientist.com/channel/astronomy/dn10020-puny-black-holes-can-eject-milky-ways-stars.html

Puny black holes can eject Milky Way's stars

NewScientist.com news service

David Shiga

CUT

Sorry for bad English.

Alfa Centaur sistem (three stars) it's at 4.4 l.y. (around 200,000
A.U.), it's not a problem for Solar Sistem, Barnard Star shall be
in the future a 3 l.y. and too it shall be not a problem for Solar Sistem,
then when a star is certainly dangerous for our sistem? When its
(minimal) distance from the Sun is 60 A.U., it can to send Neptune
in a parabolic orbit and disturb heavy the orbit of other
planets, so much that the life on the Earth can to be seriously
in danger, and this if the star has the same mass of the Sun, if
its mass is biggest it can to do the same from a biggest distance:
for to have a save life on the Earth a star with the same
mass of Sun must to be distant at minimum some hundred
of A.U., the Astronomer think that similar passages occured
in the last 4.5 billion of years around 10-20 time in the past.
The speed it's too important: it's better a quick
star that a slow star because more shall be the time at
a little distance from the Sun more are possibilities that
the planets should be perturbed, and an other factor it's
the inclination of its path respect Solar Sistem,
the inclination influence the duration of the meeting
with the Solar Sistem and then the following effects.
In all cases a star passing at some thousands od A.U.
fron the Sun it do a fall of comet toward the Sun
from Oort cloud with possibility that some fall on the
Earth, there are evidence that 2 stars in the recent
past accross the Oort cloud.
Sao 67174



.

Relevant Pages

  • Re: Space Policy Sucks, while theres Life on Venus
    ... "No one knows for sure since accurate earth temps are a little over 100 ... achieved by way of anything that our sun introduced, ... of which Sirius should afford something ... Is there another fast-tracking mega A1+ class star that's worthy of our ...
    (sci.space.history)
  • Re: Space Policy Sucks, while theres Life on Venus
    ... "No one knows for sure since accurate earth temps are a little over 100 ... achieved by way of anything that our sun introduced, ... of which Sirius should afford something ... Is there another fast-tracking mega A1+ class star that's worthy of our ...
    (sci.space.policy)
  • Re: Space Policy Sucks, while theres Life on Venus
    ... : environment of Earth. ... achieved by way of anything that our sun introduced, ... Sirius isn't the closest star system, ...
    (sci.space.history)
  • Re: Space Policy Sucks, while theres Life on Venus
    ... : environment of Earth. ... achieved by way of anything that our sun introduced, ... Sirius isn't the closest star system, ...
    (sci.space.policy)
  • Flare found on ultra-fast rotating star puzzles astronomers (Forwarded)
    ... Flare found on ultra-fast rotating star puzzles astronomers ... of a flare and its surrounding," says Uwe Wolter, lead author of the paper ... Contrary to our Sun, the site of the observed flare does not correspond to ...
    (sci.astro)