A Comet Wags Its Tail

This time-lapse video shows the tail of Comet C/2021 A1 (Leonard) over a ten days period as it approached the Sun last month. The video was made from images taken by the Solar Terrestrial Relations Observatory-Ahead (STEREO-A) spacecraft that orbits the Sun at roughly the same distance as the Earth. The video shows Comet Leonard’s tail extending, wagging, and being blown around by the solar wind. The coment has reached its closest approach to the Sun between the orbits of Mercury and Venus and is now fading as heads out of the Solar System.

Video Credit: NASA