Spacecrafts Pulled By Mystery Force
From: Stig_Agermose@online.pol.dk (Stig Agermose)
Date: Fri, 11 Sep 1998 21:36:13 -0800
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Source: The BBC
http://news.bbc.co.uk/low/english/sci/tech/newsid_168000/168410.stm
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BBC News Online: Sci/Tech
Thursday, September 10, 1998 Published at 15:06 GMT 16:06 UK
Spacecrafts pulled by mystery force
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It seems that space probes travelling through the solar system are not
behaving according to the known law of gravity, puzzling scientists.
Our science editor Dr David Whitehouse reports.
According to Nasa's John Anderson it is a real puzzle.
He said: "We've been working on this problem for several years, and we
accounted for everything we could think of."
It is all to do with the motion of space probes in the outer solar
system.
In 1972, Nasa launched Pioneer 10 to Jupiter. Since then scientists
have maintained regular radio contact with it as it passed Jupiter and
sped into deep space.
By studying the doppler shift of the radio signals from the craft
scientists have been able to calculate how fast it is travelling.
The puzzle is that Pioneer 10 seems to be slowing more quickly than it
should.
Astronomers have detected an anomaly, as if Pioneer 10 were getting an
extra pull from the Sun that cannot be explained.
No-one is sure what is to blame. A fuel leak, friction from gas in
space, thermal radiation from the spacecraft's batteries and gravity
from an unknown asteroid have all been ruled out.
Pioneer 11, launched in 1973, is also slowing at about the same rate.
The Ulysses probe, launched in 1990, is also affected. Signals from
Galileo, now orbiting Jupiter, may also show the same effect.
Scientists are a long way from suggesting that Newton's law of gravity
should be reworked.
But the same strange effect seen in four space probes is making them
think.
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RELEVANCE OF THIS MESSAGE: Strange gravity
Index: Gravity Modification (#9)
Created: Sep 12, 1998
