Re: Global warming problems in homeschool text

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Date: Sun Aug 21 2005 - 00:57:34 EDT

Global warming is not restricted to Earth.
The Denver Post

Mars finally shows it has a wonder all its own
Form discusses red planet
By Katy Human
Denver Post Staff Writer
Wednesday, November 10, 2004 -
Mars' distinctive personality is finally emerging. After five successful Mars
 missions launched in the past seven years, planetary scientists no longer
describe the fourth planet from the sun in terms of its better-known relatives
- Mars as the moon with an atmosphere, as Earth with craters.
Today, scientists know far more about the salty sea that once washed across
Mars' face and the volcanoes that erupted billions of years ago, experts said
Tuesday night at a free public Mars forum.
About 400 people attended the Denver event, part of the Geological Society of
 America's annual meeting, in which speakers outlined current knowledge of
Mars and the big questions that remain.
A few billion years ago, Mars sported liquid water and temperatures balmy
enough that life could have been possible, the scientists concluded.
"It had habitable environments," said Steven Squyres, a Cornell University
planetary scientist. "Now the question becomes, 'Were they actually
Michael Malin, president of Malin Space Science Systems, talked about gullies
 that may have been sculpted recently by liquid water; evidence of ancient
seas; and the discovery that the planet's south polar cap of dry ice is losing
"Mars is experiencing global warming," Malin said. "And we don't know why."
Philip Christensen, an Arizona State University planetary geologist, showed
spectacular images of ancient volcanoes on Mars and discussed evidence that
lava has changed composition over time, as it does in volcanoes on Earth.
"We're now doing geology on Mars," Christensen marveled.
Squyres focused on images and data collected from Spirit and Opportunity, two
 rovers currently exploring the surface of the planet long past their
expected expiration dates. The audience murmured as he scrolled through images shot
by the rovers perched on steep slopes, at the base of cliffs, drilling holes
in rock, and rumbling through ancient craters.
The recent flurry of missions to Mars continues next year when the National
Aeronautics and Space Administration expects to launch the Mars Reconnaissance
 Orbiter, built by Lockheed Martin engineers in Jefferson County.
The craft will search for evidence of water at all levels of Mars, from the
top of its atmosphere to deep underground, said Lockheed's Kevin McNeill.
Staff writer Katy Human can be reached at 303-820-1910 or at
_khuman@denverpost.com_ ( .

Jack Jackson
Received on Sun Aug 21 01:00:14 2005

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