The Cassini spacecraft spent 20 years exploring Saturn, revealing incredible details about its rings, moons, and atmosphere.

There is also a very faint ring in the orbit of Saturn's moon Phoebe. Launched in 1997, NASA's Cassini spacecraft entered Saturn's orbit seven years later and studied the planet until 2017.

In this case, from the International Space Station (ISS). NASA astronaut Don Petit, well known for his stunning photography from space, snapped this photo from the ISS while passing over Winnipeg.

Earlier this month the Mathematics Institute at Uppsala University hosted a conference called Categorification in Algebra and Topology, clearly a theme close to our collective heart. As yet there are ...