The video above shows the passage of 2015 ET across the sky on the night of March 11–12, tracked on camera from the Crni Vrh Observatory in Slovenia. It’s a time-lapse video (the time is noted along the bottom) so the effect is really neat to watch the asteroid “racing along” in front of the stars… but then, it was traveling a relative 12.4 km/second! The description on the video reads: The asteroid starts as tiny dot just below the centre of the right image and drifts gradually downwards. Due to a software glitch a correction which was meant to...