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Frosty white water ice clouds and swirling orange dust storms above a
vivid rusty landscape reveal Mars as a dynamic planet in this sharpest
view ever obtained by an Earth-based telescope.
NASA's Earth-orbiting Hubble Space Telescope took the picture on
June 26, when Mars was approximately 43 million miles (68 million km)
from Earth -- the closest Mars has ever been to Earth since 1988. Hubble
can see details as small as 10 miles (16 km) across. The colors have
been carefully balanced to give a realistic view of Mars' hues as they
might appear through a telescope.
Especially striking is the large amount of seasonal dust storm activity
seen in this image. One large storm system is churning high above the
northern polar cap [top of image], and a smaller dust storm cloud can be
seen nearby. Another large dust storm is spilling out of the giant Hellas
impact basin in the Southern Hemisphere [lower right].
Hubble has observed Mars before, but never in such detail. The biennial
close approaches of Mars and Earth are not all the same. Mars' orbit
around the Sun is markedly elliptical; the close approaches to Earth can
range from 35 million to 63 million miles.
Astronomers are interested in studying the changeable surface and
weather conditions on Mars, in part, to help plan for a pair of NASA
missions to land rovers on the planet's surface in 2004.
The Mars opposition of 2001 serves as a prelude for 2003 when Mars
and Earth will come within 35 million miles of each other, the closest
since 1924 and not to be matched until 2287.
July 5, 2001
Image Credit: NASA and the Hubble Heritage Team (STScI/AURA)