You can’t see black holes, but NASA is about to launch a rocket-propelled telescope from a remote Pacific island in search of them, the Christian Science Monitor reports.

The refrigerator-sized telescope was perched atop a rocket at a remote Pacific island launch site. On Wednesday, a carrier aircraft with the Pegasus XL rocket strapped underneath will take off from the Kwajalein Atoll, halfway between Hawaii and Australia. Upon its release, the rocket will free-fall for several seconds before igniting its engines for the climb into space.

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