-- and killed it.
WASHINGTON (AP) -- Two NASA space probes that visited Mars 30
years ago may have found alien microbes on the Red Planet and
inadvertently killed them, a scientist is theorizing.
The Viking space probes of 1976-77 were looking for the wrong
kind of life, so they didn't recognize it, a geology professor at
Washington State University said.
Dirk Schulze-Makuch presented his theory in a paper delivered at a
meeting of the American Astronomical Society in Seattle,
Washington.
The paper was released Sunday.
Based on a more expansive view of where life can take root, the
paper's findings may prompt NASA to look for a different type of
Martian life when its next spacecraft to visit Mars is launched later
this year, one of the space agency's top scientists said.
Last month, scientists excitedly reported that new photographs of
Mars showed geologic changes that suggest water occasionally
flows there -- the most tantalizing sign that Mars is hospitable
to life.
In the 1970s, the Viking mission found no signs of life.
But it was looking for Earth-like life, in which salt water is the
internal liquid of living cells.
Given the cold dry conditions of Mars, life could have evolved on
Mars with the key internal fluid consisting of a mix of water and
hydrogen peroxide, said Schulze-Makuch.
That's because a water-hydrogen peroxide mix stays liquid at very
low temperatures, or -68 degrees Fahrenheit, and doesn't destroy
cells when it freezes. It can suck water vapor out of the air.
The Viking experiments of the 1970s wouldn't have noticed
hydrogen peroxide-based life and, in fact, would have killed
it by drowning and overheating the microbes, said Schulze-Makuch.
One Viking experiment seeking life on Mars poured water on soil.
That would have essentially drowned hydrogen peroxide-based
life, he said. And different experiment heated the soil to see if
something would happen which would have baked Martian microbes.
"The problem was that they didn't have any clue about the
environment on Mars at that time," Schulze-Makuch said. "This kind
of adaptation makes sense from a biochemical viewpoint."
Even Earth has something somewhat related. He points to an
Earth bug called the bombardier beetle that produces a boiling-hot
spray that is 25 percent hydrogen peroxide as a defense weapon.
Schulze-Makuch acknowledges he can't prove that Martian
microbes exist, but given the Martian environment and how
evolution works, "it makes sense."
In recent years, scientists have found life on Earth in conditions
that were once thought too harsh, such as an ultra-acidic river in
Spain and ice-covered lakes in Antarctica.
Schulze-Makuch's research coincides with work being completed
by a National Research Council panel nicknamed the "weird life"
committee. The group worries that scientists may be too Earth-
centric when looking for extraterrestrial life.
The problem for scientists is that "you only find what you're looking
for," said Penn State University geosciences professor Katherine
Freeman, a reviewer of the NRC work.
A new NASA Mars mission called Phoenix is set for launch this
summer, and one of the scientists involved said he is eager to test
the new theory about life on Mars.
However, scientists must come up with a way to do that using the
mission's existing scientific instruments, said NASA astrobiologist
and Phoenix co-investigator Chris McKay.
He said the Washington State scientist's paper piqued his interest.
"Logical consistency is nice, but it's not enough anymore," McKay
said.
Other experts said the new concept is plausible, but more work is
needed before they are convinced.
"I'm open to the possibility that it could be the case," said
astrobiologist Mitch Sogin of the Marine Biological Lab in Woods
Hole, Massachusetts.
A member of the National Research Council committee, Sogin
also cautioned against "just-so stories about what is possible."
Scientist: NASA found life on Mars
Scientist: NASA found life on Mars
The poolhall's a great equalizer. In the poolhall, nobody cares how old you are, how young you are, what color your skin is or how much money you've got in your pocket... It's about how you move. I remember this kid once who could move around a pool table like nobody had ever seen. Hour after hour, rack after rack, his shots just went in. The cue was part of his arm and the balls had eyes. And the thing that made him so good was... He thought he could never miss. I know, 'cause that kid was me.
Scientist: NASA found life on Mars
I don't think it would be historically correct to say that "NASA-Found life on Mars"...
It's just a theory...an interesting observation, but still just a theory...
I would need alot more evidence than that, that's for sure.
It's just a theory...an interesting observation, but still just a theory...
I would need alot more evidence than that, that's for sure.
- Bill Sikes
- Posts: 5515
- Joined: Fri Aug 20, 2004 2:21 am
Scientist: NASA found life on Mars
Fibonacci;509808 wrote: -- and killed it.
WASHINGTON (AP) -- Two NASA space probes that visited Mars 30
years ago may have found alien microbes on the Red Planet and
inadvertently killed them, a scientist is theorizing. "
That could possibly be. It's one of the reasons why we should take extreme
care in space exploration, lest we absolutely wipe out any extra-terrestrial life.
Oh - that also works the other way around, of course!
WASHINGTON (AP) -- Two NASA space probes that visited Mars 30
years ago may have found alien microbes on the Red Planet and
inadvertently killed them, a scientist is theorizing. "
That could possibly be. It's one of the reasons why we should take extreme
care in space exploration, lest we absolutely wipe out any extra-terrestrial life.
Oh - that also works the other way around, of course!