BBC Sky at Night

MOONWATCH

is one of the great ray craters visible on the Earth-facing side of the Moon. Although it’s smaller than those other superb examples, 93km Copernicus and 86km Tycho, Kepler gets a visual boost due to its location within the dark lava of , a 700km x 500km basin occupying a good portion of the western half of the Moon’s

You’re reading a preview, subscribe to read more.

More from BBC Sky at Night

BBC Sky at Night2 min read
Binocular Tour
10 x 50 In the days before Herman Snellen introduced his eponymous eye-test chart, mag. +2.2 Mizar (Zeta (ζ) Ursae Majoris) and mag. +4.0 Alcor (80 Ursae Majoris) were used as an eyesight test: if you couldn’t see two stars, you knew you needed spect
BBC Sky at Night3 min read
Build A Parallax-measuring Tool
Hold up a finger and look at it with just one eye, then switch to just the other and you'll see your finger appear to ‘jump’ from side to side. The further away the finger, the smaller the jump. This apparent shift of a nearby object against a distan
BBC Sky at Night2 min read
Looking back: The Sky at Night 15 May 1974
On the 15 May 1974 episode, Patrick Moore spoke with US astronomer Carl Sagan about the many investigative strands when looking for alien life. “One is laboratory work on the question of the origin of life, making the molecules which [would]… lead ev

Related Books & Audiobooks