On 26/08/2009, at 9:03 AM, Ronn! Blankenship wrote:
What's a planet? Debate over Pluto rages on - CNN.com
No it doesn't.
*sigh*
Either planets sweep their orbits of debris in which case we have 14+
or they don't and we have 8.
But it's not a debate about Pluto. It's a debate about
On 26/08/2009, at 11:24 PM, Alberto Monteiro wrote:
Charlie Bell write:
Either planets sweep their orbits of debris in which case we have
14+ or they don't and we have 8.
Uh? Isn't it the other way around?
Um, yes. :-)
But it's not a debate about Pluto. It's a debate about whether
The Democrats can't close debate in the Senate. Republicans have no incentive
to compromise. U.S. health care reform is dead.
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Charlie Bell write:
Either planets sweep their orbits of debris in which case we have
14+ or they don't and we have 8.
Uh? Isn't it the other way around?
But it's not a debate about Pluto. It's a debate about whether we
have lots of planets or we have some planets and some
Charlie Bell wrote:
IIRC, Phobos is falling and Deimos is leaving Mars.
...and our moon is leaving too.
No, it's not. If the Sun didn't explode [*], the Earth-Moon
system would stabilize in two tidal-locked bodies.
It's all a matter of time.
Yes, but we are talking about a difference in
On 26/08/2009, at 11:41 PM, Alberto Monteiro wrote:
Charlie Bell wrote:
IIRC, Phobos is falling and Deimos is leaving Mars.
...and our moon is leaving too.
No, it's not. If the Sun didn't explode [*], the Earth-Moon
system would stabilize in two tidal-locked bodies.
Would it? The
Original Message:
-
From: Charlie Bell char...@culturelist.org
Date: Wed, 26 Aug 2009 22:09:46 +1000
To: brin-l@mccmedia.com
Subject: Re: More Pluto Goofyness . . .
On 26/08/2009, at 9:03 AM, Ronn! Blankenship wrote:
What's a planet? Debate over Pluto rages on - CNN.com
No
Maybe the 4 body problem is unstable.
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-Original Message-
From: David Hobby hob...@newpaltz.edu
Date: Wed, 26 Aug 2009 11:03:02
To: Killer Bs (David Brin et al) Discussionbrin-l@mccmedia.com
Subject: Re: More Pluto Goofyness . . .
Alberto Monteiro wrote:
Charlie Bell wrote:
IIRC, Phobos is falling and Deimos is leaving Mars.
...and our moon is leaving too.
No, it's not. If the Sun didn't explode [*], the Earth-Moon
system would stabilize in two tidal-locked bodies.
Alberto--
I'd go with doesn't, but that does make
On Aug 26, 2009, at 8:24 AM, Alberto Monteiro wrote:
Probably (my guess) Mars's moons are recent acquisitions, and won't
last forever. Venus and Mercury may have had moonlets in the past
too, that lasted a few million years and then either crashed or
flew away.
And it's entirely likely that
Bruce Bostwick wrote:
...
And why with 100+ moons, none of them has a sub-moon?
My guess would be that there just aren't many stable solutions to a
close-in three-body problem like that. Jupiter's gravitational effects
dominate the orbital dynamics of a good part of the solar system, and
On Aug 26, 2009, at 12:10 PM, David Hobby wrote:
And why with 100+ moons, none of them has a sub-moon?
My guess would be that there just aren't many stable solutions to a
close-in three-body problem like that. Jupiter's gravitational
effects dominate the orbital dynamics of a good part of
The Brin-L weekly chat has been a list tradition for over ten
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-Original Message-
From: brin-l-boun...@mccmedia.com [mailto:brin-l-boun...@mccmedia.com] On
Behalf Of Bruce Bostwick
Sent: Tuesday, August 25, 2009 10:56 PM
To: Killer Bs (David Brin et al) Discussion
Subject: Re: More Pluto Goofyness . . .
On Aug 25, 2009, at 6:03 PM, Ronn!
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