More than half of the giant alien planet candidates detected by NASA’s prolific Kepler space telescope are false positives, a new study suggests.

A team of astronomers followed up on 129 huge potential exoplanets spotted by Kepler using a ground-based telescope and found that 52 percent of the objects are actually stars, while another 2 percent are strange “failed stars” known as brown dwarfs.

“It was thought that the reliability of the Kepler exoplanets detection was very good — between 10 and 20 percent of them were not planets,” study lead author Alexandre Santerne, of the University of Porto in Portugal, said in a statement.

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