I love this whole video, from the subject matter, to the pace of Henry Hatfield's delivery, a classic.
Thank you to the amateur astronomer Martin Mobberley for putting this video on YouTube.
N.B. If you ever want to read a great biography about the late great Sir Patrick Moore, Martin has written the definitive story of his life. (two volumes)
www.amazon.co.uk/Martin-Mobberley
Well worth reading.
