Surface gravity compared with Earth can be approximated as m/r^2, where m is
in Earth masses and r is in Earth radii. If this new planet is only three
Earth masses and is 1.4 Earth radii, its surface gravity will be 1.5g. If
the planet is four Earth masses and 1.2 Earth radii, its surface gravity
will be 2.8g. 2g would seem to be a reasonable mid-range value if we take
intermediate values for size and mass.
Chris
*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
----- Original Message -----
From: "Carl 's" <[email protected]>
To: <[email protected]>
Sent: Wednesday, September 29, 2010 6:46 PM
Subject: Re: [meteorite-list] (OT) Habital Planet Discovery Announcement
Good evening All,
Sorry for being really dense about stuff like this but I don't quite
understand how a planet with a mass three to four times and a diameter 1.2
to 1.4 times Earth will only have it's gravity only slightly higher? How
much is "slightly"? Thanks for the link, Count.
Carl2
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