Scientists are baffled by a powerful and long-lasting gamma ray explosion outside our galaxy

CAPE CANAVERAL, Fla. (AP) — Scientists have discovered a gamma ray explosion outside our galaxy that’s not only exceptionally powerful, but also long-lasting.

Telescopes on Earth and in space — including Hubble — have teamed up to study the unique explosion of high-energy radiation first observed in July. Astronomers reported Tuesday it's unlike anything they've witnessed before.