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NASA has reversed a ban on six Chinese scientists from a space conference in California next month after prominent US astronomers threatened a boycott.

The US space agency has called the ban a mistake, saying officials misinterpreted a security law in barring the scientists from its Kepler Science Conference in November.

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A NASA committee has now written to the six to change course.

"We have since been able to clarify the intent of the referenced legislation and are pleased to inform you that this decision has been reversed and your paperwork is being reviewed for clearance," China's official Xinhua news agency quoted the letter as saying.

"We hope you will be able to join us," it added.

Xinhua said the space agency changed course after its initial decision caused an uproar among some US scientists.

Geoff Marcy, an astronomy professor at the University of California, Berkeley, wrote in an email to the organizers: "The meeting is about planets located trillions of miles away, with no national security implications."

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NASA reverses course on Chinese scientists ban