Our active Sun in February 2025

Happy New Year! Elizabeth Cocking continues this astronomical blog post sequence in 2024. Each month she looks back on astronomical...

IN THIS MONTH 23 December 1672 Italian astronomer Giovanni Domenico Cassini observes Rhea, one of Saturn's Moons. Cassini discovered four...

24th October 1851 William Lassell finds not one, but two moons of Uranus on the same night when he discovers Umbriel and Ariel. There is...

17th September 1789 Mimas, the smallest and innermost of Saturn's major moons, is discovered by English astronomer William Herschel...

10th August 1675 The foundation stone for the Royal Greenwich Observatory (RGO) is laid by the first Astronomer Royal, John Flamsteed. ...

Fascinating anniversaries selected by Elizabeth Cocking. 6th July 1938 Lysithea, a moon of Jupiter, is discovered by Seth Barnes...

25th June 1997 A Russian uncrewed cargo spacecraft collides with the Mir Space Station during a docking attempt knocking out much of its...

12 October 1915 Scottish born astronomer Robert Innes announced the discovery of the nearest star to our Sun, Proxima Centauri at a...