Re: Sun, stars, binary systems
- From: Craig Markwardt <craigmnet@xxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: 26 Aug 2007 03:37:29 -0400
pstanley55@xxxxxxxxxxx writes:
On Thu, 23 Aug 2007 15:48:35 +0100, "George Dishman"
<george@xxxxxxxxxxxxxxxxx> wrote:
Is it possible that it once was, and that the other star is a dwarf
<pstanley55@xxxxxxxxxxx> wrote in message
news:r26rc3pj0glrais1fv3smg74kq8bb3c5il@xxxxxxxxxx
Is our star (the sun) part of a binary star system?
No.
now and not detectable?
For a body to be a "star" -- that is, to be powered by fusion -- it
must have a certain minimum mass, probably about 10% of the mass of
the sun. There is no way such a star's gravitational pull would be
missed, since it would affect the orbits of the other planets. For
comparison, Jupiter has only 0.7% of the mass of the sun.
Low mass stars have lifetimes in the billions of years. Their
end-states are white dwarfs, which are themselves luminous, and cool
for billions of years. So it's totally implausible that such a star
existed.
It was also suggested to me that one of our planets could have been
this other star. Can that make any sense at all?
Not really. None of the planets has remotely enough mass to start
fusion, nor is any of the planets a white dwarf.
CM
.
- References:
- Sun, stars, binary systems
- From: pstanley55
- Re: Sun, stars, binary systems
- From: George Dishman
- Re: Sun, stars, binary systems
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