When researchers first spotted 'Oumuamua, it did not appear to have the characteristic tail or coma (cloud of ice and dust) that define comets, and was thought to be an asteroid. But that didn't fully explain the object's movements. Now scientists think it may be a comet after all, with valuable information about distant planetary systems. Oumuamua comes from a different star system. Its path across the sky confirms it does not originate in our solar neighbourhood.
The collision of two black holes holes—a tremendously powerful event detected for the first time ever by the Laser Interferometer Gravitational-Wave Observatory, or LIGO—is seen in this still from a computer simulation. LIGO detected gravitational waves, or ripples in space and time generated as the black holes spiraled in toward each other, collided, and merged. This simulation shows how the merger would appear to our eyes if we could somehow travel in a spaceship for a closer look. It was created by solving equations from Albert Einstein's general theory of relativity using the LIGO data.
3 years ago the GW170729 arrived on Earth. It was generated from the merger of a Binary Black Hole system, the most distant source and also the heaviest among all detected during the runs O1-O2 of the Advanced @LIGO and Advanced Virgo @ego_virgo network. pic.twitter.com/hjyLrhs7K4
— EGO-Virgo (@ego_virgo) July 29, 2020
GWs GRBs Comets Planets Sun Black-hole Neutron's star BBH Galaxy Asteroid Earth Star Solar system Exoplanet