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- Don Savage
- NASA Headquarters, Washington, DC
- (Phone: 202-358-1547) EMBARGOED UNTIL: 2:00 P.M. EST
- March 21, 1995
- Tammy Jones
- Goddard Space Flight Center, Greenbelt, MD
- (Phone: 301-286-5566)
-
- Ray Villard RELEASE NO: STScI-PR95-16
- Space Telescope Science Institute, Baltimore, MD
- (Phone: 410-338-4514)
-
-
- HUBBLE MONITORS WEATHER ON NEIGHBORING PLANETS
-
- "The weather on Mars: another cool and clear day. Low morning haze
- will give way to a mostly sunny afternoon with high clouds. The
- forecast for Venus: hot, overcast, sulfuric acid showers will
- continue. Air quality is slightly improved as smog levels subside."
-
- NASA's Hubble Space Telescope is serving as an interplanetary weather
- satellite for studying the climate on Earth's neighboring worlds, Mars
- and Venus.
-
- To the surprise of researchers, Hubble is showing that the Martian
- climate has changed considerably since the unmanned Viking spacecraft
- visited Mars in the mid-1970s, which was the last time astronomers got
- a close-up look at weather on the Red Planet for more than just a few
- months. Hubble images of fleecy clouds, and spectroscopic detection of
- an ozone abundance in Mars' atmosphere, all indicate that the planet is
- cooler, clearer and drier than a couple of decades ago.
-
- In striking contrast, Hubble's spectroscopic observations of Venus show
- that the atmosphere continues to recover from an intense bout of
- sulfuric "acid rain" triggered by the suspected eruption of a volcano
- in the late 1970s. This is similar to what happens on Earth when
- sulfur dioxide emissions from coal power plants are broken apart in the
- atmosphere to make acid rain. On Venus, this effect takes place on a
- planetary scale.
-
- Although the close-up visits by numerous unmanned spacecraft provided
- brief snapshot glimpses of weather on these planets, the long-term
- coverage offered by Hubble has never before been possible. Knowledge
- about the weather is critical to planning future missions to these
- worlds. In the case of Mars, being able to predict the weather will
- be critical prior to human exploration and, perhaps eventually,
- colonization.
-
- Studying conditions on Mars and Venus might also lead to a better
- understanding of Earth's weather system. Apparently, processes that
- occurred early in the solar system's history sent terrestrial planets
- along very different evolutionary paths. The neighboring planets are
- grand natural laboratories for testing computer models that will lead
- to a general theory of the behavior of planetary atmospheres.
-
-
- * * * * * *
-
- The Space Telescope Science Institute is operated by the Association of
- Universities for Research in Astronomy, Inc. (AURA) for NASA, under
- contract with the Goddard Space Flight Center, Greenbelt, MD. The
- Hubble Space Telescope is a project of international cooperation
- between NASA and the European Space Agency (ESA).
-
-
- NOTE TO EDITORS: Images associated with this release are available
- electronically through Internet via World Wide Web, ftp or Gopher.
- The Internet addresses are:
-
- ftp: ftp.stsci.edu (IP address: 130.167.1.2) /pubinfo/gif
- www: http://www.stsci.edu
- gopher: www.stsci.edu
-
- The image files are:
-
- Venus95.gif Color Venus
- VenusBW.gif B&W Venus
- Mars95.gif Color Mars, single face
- Mars95BW.gif B&W Mars, single face
- Mars95-3.gif Color Mars, three faces
- Mars3BW.gif B&W Mars, three faces
-
-
- A Science Backgrounder entitled "Hubble Monitors Weather on Neighboring
- Planets" is also available.
-