Hub­ble has dis­cov­ered a mys­te­ri­ous X-shaped object trav­el­ing at 11,000mph. NASA says that P/2010-A2 may be a comet, prod­uct of the col­li­sion between two aster­oids. Or a Klin­gon Bird of Prey. Either way, UCLA inves­ti­ga­tor David Jewitt is excited: This is quite dif­fer­ent from the smooth dust envelopes of nor­mal comets. The fil­a­ments are made of dust and gravel, presumably […]