https://www.facebook.com/reel/907143407238995?s=yWDuG2&fs=e
On Friday, 5 May 2023 at 17:31:47 UTC-4, StarDust wrote:
https://www.facebook.com/reel/907143407238995?s=yWDuG2&fs=e
Owing to the distances between stars in a galaxy arm, we probably wouldn't even notice it, other
than seeing it.
On Friday, 5 May 2023 at 17:31:47 UTC-4, StarDust wrote:
https://www.facebook.com/reel/907143407238995?s=yWDuG2&fs=e
Owing to the distances between stars in a galaxy arm, we probably wouldn't even notice it, other
than seeing it.
In article <efb40a37-8c8e-47c8...@googlegroups.com>
RichA <rande...@gmail.com> wrote:
Owing to the distances between stars in a galaxy arm, we probably wouldn't even notice it, other
than seeing it.
NONE of us are going to see it!
On Sunday, May 14, 2023 at 11:49:32?PM UTC-6, Colonel Bleep wrote:
In article <efb40a37-8c8e-47c8...@googlegroups.com>
RichA <rande...@gmail.com> wrote:
Owing to the distances between stars in a galaxy arm, we probably wouldn't even notice it, other
than seeing it.
NONE of us are going to see it!
Well, it's certainly true that since it is to happen some
four and a half billion years in the future, it is unlikely
anyone currently participating in this discussion will
be still around to witness it.
However, what he was saying had nothing to do with
that. He was talking about the possible consequences
of this collision, when it happened - not who would
be among those affected by it, or not, as the case may
be.
I am not so optimistic, though.
Yes, four light years, the distance between our Sun and
the closest star, is quite a long ways.
Another galaxy collides with our galaxy, and brings with
us a large portion of itself that will pass through our
stellar neighborhood.
After the first eight light years' worth of a part of the
Andromeda galaxy that is as dense with stars as our
part of our galaxy, the odds are that some star will
pass within 2 light years of Earth.
But the spiral arms of galaxies are rather big. So, before
the collision is over, the odds that some star in the
Andromeda galaxy will pass close enough to Earth to
disturb the Oort cloud, and thus send asteroids raining
down on the Earth, would seem to me rather good.
And remember that our galaxy _rotates_. This would
seem to mean that it's not actually as likely as it seems that
the Andromeda galaxy could just pass through another
part of our galaxy, and miss our neighborhood entirely.
And observations of the aftermath of other galactic collisons
show that a lot of stars get flung out into space - with enough
violence that they are unlikely to have been accompanied by
their planets.
John Savard
On Sun, 14 May 2023 23:16:20 -0700 (PDT), Quadibloc
<jsa...@ecn.ab.ca> wrote:
On Sunday, May 14, 2023 at 11:49:32?PM UTC-6, Colonel Bleep wrote:
In article <efb40a37-8c8e-47c8...@googlegroups.com>
RichA <rande...@gmail.com> wrote:
Owing to the distances between stars in a galaxy arm, we probably wouldn't even notice it, other
than seeing it.
NONE of us are going to see it!
Well, it's certainly true that since it is to happen some
four and a half billion years in the future, it is unlikely
anyone currently participating in this discussion will
be still around to witness it.
However, what he was saying had nothing to do with
that. He was talking about the possible consequences
of this collision, when it happened - not who would
be among those affected by it, or not, as the case may
be.
I am not so optimistic, though.
Yes, four light years, the distance between our Sun and
the closest star, is quite a long ways.
Another galaxy collides with our galaxy, and brings with
us a large portion of itself that will pass through our
stellar neighborhood.
After the first eight light years' worth of a part of the
Andromeda galaxy that is as dense with stars as our
part of our galaxy, the odds are that some star will
pass within 2 light years of Earth.
But the spiral arms of galaxies are rather big. So, before
the collision is over, the odds that some star in the
Andromeda galaxy will pass close enough to Earth to
disturb the Oort cloud, and thus send asteroids raining
down on the Earth, would seem to me rather good.
And remember that our galaxy _rotates_. This would
seem to mean that it's not actually as likely as it seems that
the Andromeda galaxy could just pass through another
part of our galaxy, and miss our neighborhood entirely.
And observations of the aftermath of other galactic collisons
show that a lot of stars get flung out into space - with enough
violence that they are unlikely to have been accompanied by
their planets.
John SavardIt's worse than disturbing the Oort cloud. That has happened before,
and life on Earth survived. The real problem is that if a star passes
within a light year or so (depending on the mass of the star) it will perturb the orbits of the planets. And it doesn't take very much to
make the Earth uninhabitable. That's why it's unlikely that there are
any planets with complex life in globular clusters or galactic bulges.
On Sunday, May 14, 2023 at 11:49:32?PM UTC-6, Colonel Bleep wrote:
In article <efb40a37-8c8e-47c8...@googlegroups.com>
RichA <rande...@gmail.com> wrote:
Owing to the distances between stars in a galaxy arm, we probably wouldn't even notice it, other
than seeing it.
NONE of us are going to see it!
Well, it's certainly true that since it is to happen some
four and a half billion years in the future, it is unlikely
anyone currently participating in this discussion will
be still around to witness it.
However, what he was saying had nothing to do with
that. He was talking about the possible consequences
of this collision, when it happened - not who would
be among those affected by it, or not, as the case may
be.
I am not so optimistic, though.
Yes, four light years, the distance between our Sun and
the closest star, is quite a long ways.
Another galaxy collides with our galaxy, and brings with
us a large portion of itself that will pass through our
stellar neighborhood.
After the first eight light years' worth of a part of the
Andromeda galaxy that is as dense with stars as our
part of our galaxy, the odds are that some star will
pass within 2 light years of Earth.
But the spiral arms of galaxies are rather big. So, before
the collision is over, the odds that some star in the
Andromeda galaxy will pass close enough to Earth to
disturb the Oort cloud, and thus send asteroids raining
down on the Earth, would seem to me rather good.
And remember that our galaxy _rotates_. This would
seem to mean that it's not actually as likely as it seems that
the Andromeda galaxy could just pass through another
part of our galaxy, and miss our neighborhood entirely.
And observations of the aftermath of other galactic collisons
show that a lot of stars get flung out into space - with enough
violence that they are unlikely to have been accompanied by
their planets.
On Sun, 14 May 2023 23:16:20 -0700 (PDT), Quadibloc
<jsavard@ecn.ab.ca> wrote:
On Sunday, May 14, 2023 at 11:49:32?PM UTC-6, Colonel Bleep wrote:
In article <efb40a37-8c8e-47c8...@googlegroups.com>
RichA <rande...@gmail.com> wrote:
Owing to the distances between stars in a galaxy arm, we probably wouldn't even notice it, other
than seeing it.
NONE of us are going to see it!
Well, it's certainly true that since it is to happen some
four and a half billion years in the future, it is unlikely
anyone currently participating in this discussion will
be still around to witness it.
However, what he was saying had nothing to do with
that. He was talking about the possible consequences
of this collision, when it happened - not who would
be among those affected by it, or not, as the case may
be.
I am not so optimistic, though.
Yes, four light years, the distance between our Sun and
the closest star, is quite a long ways.
Another galaxy collides with our galaxy, and brings with
us a large portion of itself that will pass through our
stellar neighborhood.
After the first eight light years' worth of a part of the
Andromeda galaxy that is as dense with stars as our
part of our galaxy, the odds are that some star will
pass within 2 light years of Earth.
But the spiral arms of galaxies are rather big. So, before
the collision is over, the odds that some star in the
Andromeda galaxy will pass close enough to Earth to
disturb the Oort cloud, and thus send asteroids raining
down on the Earth, would seem to me rather good.
And remember that our galaxy _rotates_. This would
seem to mean that it's not actually as likely as it seems that
the Andromeda galaxy could just pass through another
part of our galaxy, and miss our neighborhood entirely.
And observations of the aftermath of other galactic collisons
show that a lot of stars get flung out into space - with enough
violence that they are unlikely to have been accompanied by
their planets.
John Savard
It's worse than disturbing the Oort cloud. That has happened before,
and life on Earth survived. The real problem is that if a star passes
within a light year or so (depending on the mass of the star) it will
perturb the orbits of the planets. And it doesn't take very much to
make the Earth uninhabitable. That's why it's unlikely that there are
any planets with complex life in globular clusters or galactic bulges.
It's worse than disturbing the Oort cloud. That has happened before,
and life on Earth survived. The real problem is that if a star passes
within a light year or so (depending on the mass of the star) it will
perturb the orbits of the planets. And it doesn't take very much to
make the Earth uninhabitable. That's why it's unlikely that there are
any planets with complex life in globular clusters or galactic bulges.
I do wonder if things could "settle down" for a long time in
globular clusters or galactic bulges for long enough for
civilizations to evolve. They'd stand a good chance of being erased
by the crowded nature of the neighborhood eventually, but maybe
some could exist for a while. Just my idle speculation.
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