NASA is canceling all work on a new space telescope designed to seek out black holes and other cosmic mysteries through X-ray light due to soaring development costs, the space agency announced Thursday.

The mission, called Gravity and Extreme Magnetism Small Explorer (GEMS), was running significantly over budget, said Paul Hertz, director of NASA's Astrophysics Division, during a phone call to reporters Thursday.

"The GEMS project was initiated under a very well-defined cost cap," Hertz said. "As they approached their confirmation review, it was clear they would not be able to complete it within their cost cap. NASA made the very difficult decision not to confirm GEMS into the implementation phase."

The mission team had almost completed the design stage of the project and was nearing the point where hardware for the mission would begin to be built. No working instruments were yet constructed, Hertz said. [ NASA's 2013 Budget: What Will It Buy? ]

The project was selected as a "small explorer"-class mission, with a firm cost limit of $105 million, not including the price of launching the spacecraft. NASA recently commissioned an independent review of GEMS' budget, and found that the ultimate price tag for the spacecraft was likely to be 20 to 30 percent over budget.

Because of the cost overrun, NASA decided to pull the plug on GEMS last month. On Tuesday, the GEMS team, led by principal investigator Jean Swank of the agency's Goddard Space Flight Center in Greenbelt, Md., appealed the decision and submitted documents to show they had identified new areas of cost savings.

However, NASA was not swayed.

The space agency will now have to pay an estimated $13 million in close-out costs to cancel the mission, including contract cancelation fees to Orbital Sciences Corp. and other companies that were hired to built the spacecraft.

GEMS was to use three telescopes to capture the bent X-ray light from extremely dense objects such as black holes, neutron stars and stellar remnants. The mission would have launched no earlier than 2014 and lasted two years.

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NASA pulls the plug on X-ray telescope plan