The comets A6 (Lemmon) and R2 (SWAN) are visitors from the chilly fringes of our solar system, and could even be visible at the same time. By Marina Koren If you like comets, this month is shaping up ...

What could we choose as the seven most remarkable celestial objects visible either with our eyes or with a small telescope? "The Seven Wonders of the Ancient World" is the first known list of the most ...

Deep-sky astrophotographers are in for a treat this month, with some of the most beautiful nebulae — and a globular cluster — at their best, though with the solstice on 20 June, astronomical darkness ...

Is this comet the oldest thing we've seen in the solar system? A new telescope, built to track fast-moving objects in space, has caught an interstellar comet from beyond the solar system, before ...