Pebbles are scattered all over Earth. Mars has plenty of pebbles too. They may seem like a mundane bit of geology, but a specific clutch of pebbles spotted by NASA's Perseverance rover captured ...

Shape shifter: the images reveal a large variation in the shape of exocomet belts (courtesy: Prof Luca Matra, Trinity College Dublin) Astrophysicists have released a series of images of exocomet belts ...