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NASA’s planet-hunting telescope out of action
The Kepler space telescope inside the Hazardous Processing Facility at Astrotech in Titusville, Florida, before its launch (CREDIT: NASA)
A NASA telescope dispatched to hunt for Earth-like planets has lost use of its positioning system, threatening its mission.
Launched in 2009, the Kepler space telescope revolutionized the study of so-called exoplanets, with discovery of 130 worlds orbiting distant stars and 2,700 potential planets still awaiting confirmation.
The telescope was designed to examine about 100,000 distant sun-like stars, searching for planets passing by, or transiting, relative to its line of sight. Detecting slight dips in the amount of light from a planet crossing the face of its parent star requires extremely precise pointing.
But officials reported late yesterday that the telescope, the cornerstone of a $650m mission, lost that ability on Tuesday when a second steadying spinning wheel stopped working.
The telescope needs at least three of its four wheels operating to hunt for planets. It lost use of its first wheel last year.
"It certainly is not good news for the mission, which has been performing so well and had so much promise for doing even better," deputy project manager Charles Sobeck, with NASA's Ames Research Center, told reporters during a conference call on yesterday.
The telescope is orbiting about 40 million miles from Earth, too far for a robotic or astronaut-led repair mission, added John Grunsfeld, NASA's associate administrator for science.
"We're not ready to call the mission over, but by any measure this has been a spectacularly successful mission," Grunsfeld said.
In addition to trying to get the failed wheel working, engineers and scientists will be looking for alternative ways of operating the telescope.
They also will assess if Kepler could be used for other types of astronomical observations which do not require such precise pointing.
The goal of the mission is to find Earth-sized planets located at a distance from their parent stars that would allow them to have the right temperatures for liquid surface water – known as the Goldilocks Zone as it is not too hot or two cold.
Though the telescope currently isn't collecting any data, scientists have years of archived observations still to analyse.
"The mission was designed for four years. It operated four years. It gave us excellent data for four years. So I'm very delighted," said Kepler lead scientist William Borucki, with NASA's Ames Research Center in Moffett Field, California.
"I would have been even happier if it continued another four years because we'd have better data about more stars, about smaller planets and we'd have more planets that we'd probably find in the habitable zone," Borucki added.
"That would have been, in some sense, frosting on the cake, but we have an excellent cake right now."
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