WASHINGTON, March 7 (PNA/Xinhua) — Astronomers said Thursday they have witnessed for the first time the breakup of an asteroid, disintegrating into as many as 10 smaller pieces at a “leisurely” speed. The crumbling asteroid, designated P/2013 R3, was first noticed as an unusual, fuzzy-looking object by ground-based telescopes in Arizona on Sept. 15, 2013, the researchers reported in the U.S. journal Astrophysical Journal Letters. A follow-up observation on Oct. 1 with the W. M. […]