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News Release 79 of 178

October 11, 2001 01:00 PM (EDT)

News Release Number: STScI-2001-31

Scientists Track "Perfect Storm" on Mars

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Image: Scientists Track "Perfect Storm" on Mars

Scientists Track "Perfect Storm" on MarsSTScI-PRC2001-31

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ABOUT THIS IMAGE:

Two dramatically different faces of our Red Planet neighbor appear in these comparison images showing how a global dust storm engulfed Mars with the onset of Martian spring in the Southern Hemisphere. When NASA's Hubble Space Telescope imaged Mars in June, the seeds of the storm were caught brewing in the giant Hellas Basin (oval at 4 o'clock position on disk) and in another storm at the northern polar cap.

When Hubble photographed Mars in early September, the storm had already been raging across the planet for nearly two months obscuring all surface features. The fine airborne dust blocks a significant amount of sunlight from reaching the Martian surface. Because the airborne dust is absorbing this sunlight, it heats the upper atmosphere. Seasonal global Mars dust storms have been observed from telescopes for over a century, but this is the biggest storm ever seen in the past several decades.

Mars looks gibbous in the right photograph because is it 26 million miles farther from Earth than in the left photo (though the pictures have been scaled to the same angular size), and our viewing angle has changed. The left picture was taken when Mars was near its closest approach to Earth for 2001 (an event called opposition); at that point the disk of Mars was fully illuminated as seen from Earth because Mars was exactly opposite the Sun.

Both images are in natural color, taken with Hubble's Wide Field Planetary Camera 2.

 

Object Name: Mars

Image Type: Astronomical/Annotated

Credit: NASA, James Bell (Cornell Univ.), Michael Wolff (Space Science Inst.), and The Hubble Heritage Team (STScI/AURA)

NEWS RELEASE IMAGES

The above montage includes these images:

Mars Dust Storm Brews in Hellas Basin and Northern Polar Cap Image Type: Astronomical Mars Dust Storm Brews in Hellas Basin and Northern Polar Cap Dust Storm Engulfs Mars Image Type: Astronomical Dust Storm Engulfs Mars

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