Moonwatch

December’s top lunar feature to observe
Comets and asteroids

Asteroid Herculina should be an easy spot in Orion and Taurus this month
Star of the month

At the river’s end, Cursa, 2nd-brightest star in Eridanus
Binocular tour

This month, we turn at a T-junction, pop into a house and admire the Christmas Tree
The Sky Guide Challenge

Can you resolve not just the Trapezium Cluster but its fainter hangers-on?
Deep-sky tour

We explore the best celestial sights around Aries, Pisces and Triangulum
At a glance

How the Sky Guide events will appear in December
ROYAL MUSEUMS GREENWICH

rmg.co.uk/astrophoto
How to deflect an asteroid

An epic trial run of a plan that may one day save Earth took place in September
Apollo 17

Apollo leaves its final footprints on the Moon in a mission marked by several remarkable firsts