Venus Has Frequent Bursts of Lightning
Pastor Dale Morgan
Nov 29, 6:15 PM EST
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Venus Has Frequent Bursts of Lightning*
By SETH BORENSTEIN
AP Science Writer
WASHINGTON (AP) -- Nearby Venus is looking a bit more Earth-like with
frequent bursts of lightning confirmed by a new European space probe.
For nearly three decades, astronomers have said Venus probably had
lightning - ever since a 1978 NASA probe showed signs of electrical
activity in its atmosphere. But experts weren't sure because of signal
interference.
Now a magnetic antenna on the European Space Agency's Venus Express
probe proved that the lightning was real.
"We consider this to be the first definitive evidence of abundant
lighting on Venus," David Grinspoon of the Denver Museum of Nature and
Science told reporters Wednesday at a briefing in Paris.
The finding is significant because lightning affects atmospheric
chemistry, so scientists will have to take it into account as they try
to understand the atmosphere and climate of Venus, he said.
The lightning is cloud-to-cloud and about 35 miles above the surface,
said University of California, Los Angeles geophysics professor C.T.
Russell, lead author of a paper on the Venusian fireworks. It is being
published in Thursday's issue of the journal Nature.
Bursts of electrical energy from lightning are something that scientists
have long theorized could provide the spark of life in primordial ooze.
But not on Venus.
"If life was ever something serious to talk about on Venus, it would be
early in its history, not in its current state," said Sean Solomon of
the Carnegie Institution of Washington, who was not part of the research
team. "It's a very unforgiving atmosphere."
The idea of Earth-like lightning is fascinating, Russell said. However,
you couldn't see it from Venus' surface, nor would you want to look
because the Venusian atmosphere is 100 times more dense than Earth's, is
about 900 degrees hotter and has clouds of sulfuric acid, he said.
"It may be Earth's 'evil twin,' but it is in many respects Earth's
twin," Russell said.
What excites astronomers most about the lightning discovery is simply
the coolness factor.
Venus' weather forecasts have long thought to be "kind of boring ...
steady winds for the next 400 years," said Allan Treiman, a senior
scientist at the Lunar and Planetary Institute in Houston, who isn't
affiliated with the research. The idea of lightning, he said, adds a
spark to Venus' weather.
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AP science writer Malcolm Ritter in New York contributed to this report.
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On the Net:
Nature: http://www.nature.com/nature
Venus Express: http://www.esa.int/venus