Ces lasers verts provenant d'un satellite chinois serviraient à mesurer la pollution atmosphérique. Ils ont été filmés par un téléscope japonais le 28 janvier dernier. Source

We're looking forward to the new sci-fi film "Arrival", which explores the barriers to communicating with aliens even face to face. Astronomers really are trying to listen for alien communications, mostly using radio receivers but increasingly by looking for optical laser transmissions too. One ...