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If the orbiter were left to circle Jupiter after running out of propellant (barring an intervention, this would likely happen within a year), it might eventually crash into Europa, one of Jupiter's large moons.
The probes will use existing orbiters for communication relay if the orbiter architecture proves too ambitious.
But if the orbiter misses the mark, it will be a major disappointment.
If the orbiter picked up plagioclase, there may have been a little iron in it – but more importantly, there was probably a heck of a lot of it.
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One large piece, about six inches square, came off 6 minutes 17 seconds into flight, but by that time the shuttle had largely risen out of the atmosphere, and the foam, even if it hit the orbiter, would not have hit with much velocity.
If all goes as planned, the orbiter will take about 47 minutes to reach Earth orbit, where it will stay until Dec. 1 before starting the 240-million-mile voyage to Mars.
Professor Wickramasinghe said: "If the Rosetta orbiter has found evidence of life on the comet, it would be a fitting tribute to mark the centenary of the birth of Sir Fred Hoyle, one of the undisputable pioneers of astrobiology".
Industry says the timetable for construction for the joint missions, particularly for the orbiter, is tight if launch dates are to be met; and that it cannot wait much longer to start fabrication of key components.
Scientists have been examining radio transmissions between the orbiter and the lander to see if they can triangulate a position.
"We knew if we fractured the carbon-carbon on the leading edge of the orbiter, it was a lost day," he said.
If so, the agency may order the first spacewalk to the underside of the orbiter to correct the problem, officials said.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com