The Planets (5*)
This is a book packed with incredible, fascinating detail which Mrs. D. has thoroughly enjoyed being told about, especially when watching television, reading a book of her own or settling down to go to sleep.
My knowledge of the solar system had changed little since the nineteen-sixties. It was based on the moon landings, a 1957 set of Brooke Bond tea cards, the nineteen-sixties encyclopaedia Knowledge which came out in weekly parts, and my dad’s Arthur Mee’s Children’s Encyclopedia from the nineteen-twenties. These two tea cards just about sum it up.
I mentioned this at home, and for my birthday there appeared a brand new copy of The Planets by Andrew Cohen with Brian Cox, published in 2019 to accompany the television series of the same name. Professor Cox presented the series: it gave him an excuse to pose in all sorts of weird and wonderful locations, such as the Wadi Rum in Jordan, and pretend he was on the surface of other worlds. He is credited with just one of the six sections of the book. The others are by Andrew Cohen, the executive producer of the series.
It is very readable and accessible. Perhaps only once or twice did I feel bogged down in too much information, but that may have been because I was rushing to get to the next astonishing section. Let me pick just a few of the snippets Mrs. D. so much appreciated hearing about, to try on your loved ones in deciding whether or not to get the book yourself.
 |
| Olympus Mons |
1) There are some extraordinary mountains elsewhere in the Solar System. Olympus Mons on Mars, a volcano of 21,000 metres, is around two and a half times the height of Mount Everest. It looks a bit like, well, yes, it does.
 |
| Artist’s impression of the Curiosity sky crane |
2) Staying on Mars, the Curiosity landing vehicle has provided us with many high quality images of the surface. It was so heavy (998kg or around a ton) that to have dropped it on to the surface in the usual way could have damaged it beyond repair. It was therefore lowered gently at a rate of one metre per second from a “sky crane” hovering twenty metres above the surface. The sky crane then flew off so as not to fall on the landing vehicle. How on earth did they think of that, and how did they get it to work?
 |
| Jupiter |
3) The planetary orbits have not always been as they are now. It is thought that as the Solar System was forming, four and a half billion years ago, Jupiter moved closer to the sun and then back out again (known as the grand tack hypothesis), taking with it thousands upon thousands of blocks of rocks and ice to form the asteroid belt. This reduced the amount of material available for the inner planets to form, which is why Mercury, Venus, Earth and Mars are much smaller than Jupiter, Saturn, Uranus and Neptune.
 |
| Artist's impression of the surface of Titan |
4) The time-scales are unimaginable. Over the next five billion years, the Sun will grow hotter and expand to engulf Mercury and Venus, although the lifeless, burnt-out Earth may just escape this fate. At the same time, the outer planets will begin to warm. Worlds such as Titan, a moon of Saturn where lakes and rivers of methane run through mountains of ice, will thaw to have oceans of liquid water full of complex organic chemicals, just the kind of place where life might originate all over again.
 |
| Pluto |
5) Pluto, which was only discovered in 1930 and appears in the Brooke Bond tea cards as the ninth planet, is no longer classified as a planet …
[note: at this point Mrs. D. snatched the book from Tasker’s grasp and beat him about the head with it].
