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TIME: Almanac 1990s
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1994-03-25
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<text id=92TT2469>
<title>
Nov. 02, 1992: Fire and Ice
</title>
<history>
TIME--The Weekly Newsmagazine--1992
Nov. 02, 1992 Bill Clinton's Long March
</history>
<article>
<source>Time Magazine</source>
<hdr>
THE WEEK, Page 23
HEALTH & SCIENCE
Fire and Ice
</hdr><body>
<p>Frozen water has been found on the searing surface of Mercury
</p>
<p> The planet Mercury is truly a hellish place: it is one-third
as far from the sun as Earth, and its daytime temperatures can
reach 430 degreesC (800 degreesF). The last thing scientists
expected to find there was ice. But that is just what a new
radar study of Mercury, reported in Science, has detected.
Planetary scientists at NASA's Jet Propulsion Lab and at Caltech
aimed powerful radar beams at both of the planet's poles; the
return signals bore the telltale signs of having bounced off a
frozen surface. Like Earth and Mars, Mercury appears to have
polar ice caps.
</p>
<p> How is it possible? An analysis by UCLA scientists points
out that while the poles are bathed in scorching sunlight, the
light hits at such a shallow angle that the floors of some
craters are permanently in shadow. With no atmosphere to move
heat around, the temperature in these spots is far below zero.
Any ice that condensed as frost in the craters billions of years
ago when water boiled on the planet's surface as it formed would
still be around today -- and evidently is.
</p>
</body></article>
</text>