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 ")

Laser-Powered Spacecraft To Explore The Solar System
'Whoever launched it fired a laser cannon... for about forty-five years, so the intruder would have a beam to travel on...'- Niven/Pournelle, 1974.

SKYLON Space Plane Gets Boost
'They were more airplane than spaceship...'- Robert Heinlein, 1951.

Europe's Cheops To Look For Habitable Planets
'I was near enough it now to set my automatic astronomical instruments to searching it for a habitable planet.'- Edmond Hamilton, 1936.

SpaceX Dragon First Private Craft To Dock With ISS
'Why, the ship wasn't a proper deep-space craft at all.'- Robert Heinlein, 1941.

 

Google
  Web TechNovelgy.com   

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.

 

 

 

 

 

Current News

Hackers Can Take Control Of Cars From Anywhere In The World
'The car faltered as the external command came to brake...'

Armed Drone Opens Fire
'Each a television eye and a sonic stunner...'

Robotic Exoskeleton Releases Man From Wheelchair
'This man was standing on two corrugated-soled titanium footplates...'

Oh, Just Let Robots Run Airports
I'd like a friendly robot to help me at airports.

How Smart Should AI's Be Allowed To Get?
'Every AI ever built has an electromagnetic shotgun wired to its forehead'

NASA Misses $5Trillion Funding Boost
'This must be a golden planet—this little asteroid.'

Kuwait Creates Mandatory DNA Database For Citizens
And who has the largest DNA database on its citizens?

Please, Please Let There Be Regenerated Teeth
'Toothbud transplants...'

Google AI 'Deep Dreams' Kubrick's 2001
'I was only trying to do what I thought best....'

The BLITAB: First Tactile Tablet for Blind People
Absolutely amazing development - now blind people can read the web!

Why, Oh Why, Must We Develop Robots That Run Faster Than I Do?
'The legs are long, curled way up to deliver power, like a cheetah's.'

Golf Robot Putts Out
'The robot solemnly hit a ball against the wall, picked it up and teed it, hit it again, over and again...'

Computer Finds Cancer Doctors Miss
The computer will see you now.

Would Robot Taxis Ease Carbon Emissions?
'He emerged and flagged down a robot taxi...'

Brainwaves As Biometric Identification
'The doors of Mr. Lars, Incorporated, shut, tuned as they were to his own cephalic pattern.'

What-If Machine Concocts Creative Premises
'Books were just a commodity that had to be produced, like jam or bootlaces.'

More SF in the News Stories

More Beyond Technovelgy science news stories

Home | Glossary | Invention Timeline | Category | New | Contact Us | FAQ | Advertise |
Technovelgy.com - where science meets fiction™

Copyright© Technovelgy LLC; all rights reserved.