A broken cable smashed a hole 100 feet wide in the Arecibo Observatory, which searches for aliens and tracks dangerous asteroids

· A cable broke and tore a hole in the Arecibo Observatory in Puerto Rico on Monday.
· The telescope had just reopened to study a potentially dangerous asteroid, shortly after Tropical Storm Isaias passed over the island.
· It's unclear why the cable broke, but the facility is closed again as engineers assess the damage.
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