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- Xref: sparky sci.space:16188 alt.sci.planetary:341
- Newsgroups: sci.space,alt.sci.planetary
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!destroyer!cs.ubc.ca!fs1.ee.ubc.ca!davem
- From: davem@ee.ubc.ca (david michelson)
- Subject: Re: space news from Oct 23 Science (not AW&ST)
- Message-ID: <1992Nov20.204705.18524@ee.ubc.ca>
- Organization: University of BC, Electrical Engineering
- References: <Bxzonr.6uE@zoo.toronto.edu> <2421@usna.NAVY.MIL>
- Date: Fri, 20 Nov 1992 20:47:05 GMT
- Lines: 27
-
- In article <2421@usna.NAVY.MIL> wdw@math2.sma.usna.navy.MIL (Wm. Douglas Withers -- math FACULTY <wdw@sma.usna.navy.mil>) writes:
- >
- >I wonder why the same techniques can't be used to shed light on the question
- >of the presence of ice at the Moon's poles. Comments, anyone?
- >
-
- It's a matter of the relative inclination of the orbits of Mercury and Earth.
-
- From Slade, Butler, and Muhleman, ``Mercury Radar Imaging: Evidence for Polar
- Ice,'' Science, 258, 635--640, 23 Oct 1992:
-
- "On both days, the sub-earth latitudes were far enough north for our
- instruments to see over the north pole and into areas thought to be
- permanently shadowed from the sun."
-
- Figures 1 and 3 in Harmon and Slade, "Radar Mapping of Mercury..." which
- follows immediately after the Slade et al. paper, make this very clear.
-
- We simply can't see the moon from the same aspect from the earth's surface.
-
- We *really* need to get a lunar polar orbiting geochemical mapper built and
- launched!
-
- --
- Dave Michelson
- davem@ee.ubc.ca
-
-