Observing

Nova in Hercules brightening fast

14 June 2021 Mark Armstrong

A relatively bright nova was discovered on 12 June in the northern constellation of Hercules (Nova Her 2021) and within just a few hours of its discovery it had brightened by around two magnitudes.

Observing

Why do eclipses happen?

9 June 2021 Keith Cooper

Solar eclipses are relatively rare; they happen when the Moon moves directly and precisely in front of the Sun. Why are they so infrequent, and why do solar eclipses always come in pairs with lunar eclipses?