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Left: Asteroid 2867 Steins. Credit: OSIRIS Team MPS/UPM/LAM/IAA/RSSD/INTA/UPM/DASP/IDA
Right: Ferrous oxide puck hit by an electric discharge. Credit: C. J. Ransom/VEMASAT Labs.



Rosetta Sees a Stone Called Steins
Mar 19, 2009

An asteroid with an enormous crater prompts another question of why it was not destroyed by the "impact."

"Because in the beginning was the plasma."--- Hannes Alfvén in his Nobel Lecture on December 11, 1970.

On March 2, 2004, the European Space Agency (ESA) launched the Rosetta Cometary Probe on a rendezvous mission with 67 P/Churyumov-Gerasimenko, a short period comet that will enter perihelion in August of 2015. One year after launch, Rosetta received a gravity assist from Earth in order to boost its speed and conserve fuel. In February 2007, Mars kicked-up the space probe's velocity and swung it back around Earth again, where it was accelerated toward an encounter with Asteroid 2867 Steins. In November 2009, Rosetta will circle the Earth for the last time in order to receive its final push into deep space.

In May of 2014, Rosetta will awaken from deep space hibernation and enter orbit around 67 P/Churyumov-Gerasimenko. The spacecraft will release a science platform called Philea, which will attempt a soft landing and assess the cometary nucleus as it begins to generate a coma and tail. Rosetta will be in orbit around the comet during the entire year of its inward journey, monitoring Philea and analyzing the coma. The mission will end when the Sun's energy fries the spacecraft.

2867 Steins is a small, irregular body with a maximum diameter of six kilometers. Based on information received from the Rosetta OSIRIS imaging system, a pair of craters was found with a combined diameter equal to more than 20% of the asteroid's volume. Mission specialists are "amazed" that the 2-kilometer "impact site" did not blast Steins into tiny fragments.

According to H. Uwe Keller, the OSIRIS camera team's lead investigator, Steins is probably shattered throughout its interior because of the shockwaves from whatever obliterated its parent body eons ago. As conventional theories of asteroid formation propose, the big craters and the string of seven smaller craters probably came about when that primordial parent experienced its death paroxysm.

Current asteroid composition and formation estimates are largely based on the anomalous cratering that each one exhibits. Images of Asteroids 253 Mathilde, 243 Ida, and 433 Eros reveal them to be heavily pock marked with craters large and small, prompting scientists to speculate that they are really loose conglomerations of rocks and soil, rather like a big gravel pit in space. Because they were not blown apart from meteoric impacts, say astrophysicists, they most likely "absorbed" the energy in the same way as a pile of sand will cushion the shock when hit by a stone. But does the gravel pit hypothesis fit the facts or should we look for one that does not depend on revision each time some new discovery sends a spanner into the works?

The electrical history of the solar system includes intensely energetic events and violent interactions between charged planets and moons. Electric arcs can remove material with ease as is evinced by the experiments conducted by Dr. C. J. Ransom of VEMASAT Laboratories. Plasma discharges can excavate surface depressions, scoop out material, and explode it into space, leaving cleanly cut features. Electric discharge machining (EDM) accomplishes the same thing on a smaller scale in manufacturing processes.

EDM plasma arcs are used because they do not disturb the surrounding surfaces. Based on laboratory analysis, that is what has occurred on 2867 Steins and on all the asteroids, moons, and planets of the solar system. At the outset, however, planetary scientists exclude the electrical explanation – which rectifies the anomalies in other theories – because they know almost nothing about the forces involved except to parrot: "if there's electricity in space it doesn't do anything." It never occurs to them that electricity can create the very things they now struggle to understand.

By Stephen Smith



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