“Enigma” –Unexpected  Gain in Speed: Oumuamua, First Interstellar Object Discovered in the Solar System (Today’s Most Popular)

`Oumuamua, the first interstellar object discovered in the Solar System, is moving away from the Sun faster than expected. This anomalous behavior was detected by a worldwide astronomical collaboration including ESO’s Very Large Telescope in Chile. New results this June suggest that `Oumuamua is most likely an interstellar comet and not an asteroid.