Science Fiction
Dictionary
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
 |
Pioneer Space Probes Unexpectedly Slow Down In Deep Space
Pioneer 10 and 11 were launched in 1972 to explore Jupiter and Saturn; these remarkably successful and durable spacecraft fulfilled the expectations of their designers. The last bits of data from Pioneer 10 were received in early 2003 following over 30 years of continuous operation; the spacecraft was 12 billion kilometers from the sun.
(From Aerospace Analysis Helps Confirm)
However, once they passed beyond the orbit of Uranus, the radio signals sent back by the aging craft have been shifted to progressively shorter wavelengths. This implies that they are decelerating slightly; no one knows why this is happening.
Some space scientists are calling for a deep-space mission to try to understand this behavior - called the Pioneer anomaly. Mundane reasons for this effect have been brought forward; it could be due to leakage of gaseous fuel from the thrusters, for example. However, some scientists wonder if the Pioneer anomaly may be due to some previously unknown forces that are only noticed outside the solar system.
(From Pioneer 10 aerospace physics)
A number of possible causes have been ruled out by Philip Laing and Anthony Liu, working under a NASA Office of Space Science grant:
- Errors in JPL's orbital determination software
- Gravity of the Kuiper belt and gravity from the galaxy
- Errors in the planetary ephemeris
- Errors in the values of the Earth's orientation, precession, and nutation
- Nongravitational effects from solar pressure and attitude control maneuvers
- Solar wind and interplanetary medium
- Nominal thermal radiation and plutonium half-life
- Drifting clocks, general relativity, and the speed of gravity
- Hardware problems at the tracking stations.
Slava Turyshev of NASA's JPL in Pasadena thinks that the issue is worth exploring even if it turns out to be a gas leak, which is considered the most likely cause. Working on this problem forces space engineers to rethink their methods for very precise navigation in space. There is a possibility that upcoming space missions may be modified to try to verify (or disprove) the idea that unknown physical forces are behind the Pioneer anomaly.
However, no explanation based on conventional physics has been found; the effect is so persistent that it could indicate some physical principle not yet considered in previous explanations of the motions of the planets. Meanwhile, Pioneer 10 is on its way to the giant red star Aldebaran. Estimated time of arrival - 2 million years from now.
As soon as I read this story, I thought about the classic 1950 sf novel Brain Wave by Poul Anderson. At the time of the story, the sun moves out of a field that pervades a huge area of space, one which depresses electrochemical and electromagnetic phenomena - including human neural function. The result of the solar system leaving this field is that everyone on Earth immediately gains about one hundred IQ points due to increased synaptic speed.
Read more at Following in Pioneer's Footsteps and Aerospace analysis helps confirm unexplained pull on spacecraft.
Scroll down for more stories in the same category. (Story submitted 11/23/2004)
Follow this kind of news @Technovelgy.| Email | RSS | Blog It | Stumble | del.icio.us | Digg | Reddit |
Would
you like to contribute a story tip?
It's easy:
Get the URL of the story, and the related sf author, and add
it here.
Comment/Join discussion ( 41 )
Related News Stories - (" Spacecraft ")
Europa Clipper Plate Carries A Special Message
'...a universal cryptogram — yet it is one which can be interpreted by any intelligent creature on any planet in the Solar System!' -
China Wants To Build Mega Space Ships
'Don't do anything to endanger our shipping privileges...' - Frank Herbert, 1965.
Dream Of Building Your Own Rocket?
Fiorello Bodoni, you inspire all of us.
Used Dragon Cargo Spacecraft Will Fly Again
'the overstrained meters made the smaller craft skittish as a young horse...' - Robert Heinlein
Technovelgy (that's tech-novel-gee!) is devoted to the creative science inventions and ideas of sf authors. Look for the Invention Category that interests you, the Glossary, the Invention Timeline, or see what's New.
Science Fiction
Timeline
1600-1899
1900-1939
1940's 1950's
1960's 1970's
1980's 1990's
2000's 2010's
Current News
Tiny Flying Robot Weighs Just One Gram
'Aerostat meant anything that hung in the air. This was an easy trick to pull off nowadays.'
Some Ringworld Configurations Are Stable
'The Ringworld had no horizon. There was no line where the land curved away from the sky.'
TRANSFORM Dynamic Furniture Concept Becomes What You Need
'An adjustment panel outside the door would cause it to extrude various appurtenances in memory plastic...'
Harvard Metamaterials Change Structure Instantly
'Annealed in any shape for a time, and codified, the structure of that shape is retained down to the molecules.'
SnapBot Robots - You Choose Their Legs And They Choose Their Gaits
It's not really polite to tear the limbs off robots.
Dino From Magical Toys An AI Companion To Children
'...the imaginary companions discovered by needful children.'
Humanoid Robots Building Humanoid Robots
''Pardon me, Struthers,' he broke in suddenly... 'haven't you a section of the factory where only robot labor is employed?''
Darpa 'Defiant' Unmanned Autonomous Ship
'There was no wheel, and no steersman!'
What's The Best Way To Ship And Unpack Humanoid Robots?
'I opened the oblong box, where lay the automatons side by side...'
DNA Printed Book By Isaac Asimov Now Available
'They tied the memory to the bloodline and that was their record!'
AI Computer Chip Designs Passeth Human Understanding
'It seems that at one time computers were designed directly by human beings.'
Space Traffic Management (STM) Needed Now
'...the spot was a lonely one in an uncharted region, far from the normal lanes of space traffic.'
Fine-Tune Your Infinite Book The Way You Want It
'I squatted down beside the roller and tried to make some sense out of the knobs. There were thirty-nine of them...'
SpiRobs Soft Spiral Robotic Arm
'Beware the long, flexible, glittering tentacles...'
Holland Factory 3D Printing 500 Tons Of Steak Per Month
'...I don’t understand technical things — tell me, does it ever feel anything?"
Stratospheric Solar Geoengineering From Harvard
'Pina2bo would have to operate full blast for many years to put as much SO2 into the stratosphere as its namesake had done in a few minutes.'
