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Moon Observer's Guide by Peter GregoPhilip’s Moon Observer’s Guide, Peter Grego (Philip’s 2015)

If you ask someone to name the most important inventions in history, two will often be overlooked: the microscope and the telescope. You could say that one lowered the floor of the universe and the other raised the ceiling: we suddenly became aware of wonders that had previously been too small or too far away for us to see.

Practically speaking, the microscope might seem by far the more important, because it’s taught us so much about life on earth, not least our own. But the continued existence of humanity may actually depend on the telescope. Geologists have discovered that the earth has repeatedly been struck by asteroids; astronomers may be able to spot the next one before it hits. Otherwise we may follow the dinosaurs, trilobites, eurypterids and countless other once-flourishing groups into extinction.

If you want to see what asteroids and other large rocks can do to a celestial body, Mother Nature has kindly provided us with a giant memento mori: the Moon. The biggest scars there are visible with the naked eye, but it took the telescope to reveal quite what they looked like and quite how pock-marked the lunar surface is. As Peter Grego writes:

All the Moon’s ringed basins, ‘walled plains’ and the overwhelming majority of craters visible through the telescope were formed by asteroidal impact. […] Copernicus was blasted out of the lunar crust about 800 million years ago by an asteroid measuring up to 10 km across. The 29 km diameter crater Kepler, 500 km to the west of Copernicus, was formed at around the same time. (“Lunar geology and the Moon’s features”, pp. 13-4)

Grego knows a lot about the Moon and this book is the fruit of more than thirty years of selenoscopy, dating back to his first “systematic observations” in 1982:

Since that time, through patient observing and recording, the lunar landscape has become to me a broadly familiar place, yet always full of wonder. Today only a sliver of moon is visible, and the eastern lunar seas and their surrounding craters provide a visual delight until the Moon sinks into the haze above the city and its image dims, shimmers and degrades. (pg. 5)

The city was Birmingham back in 2002. Cities aren’t just noisy, dirty and harmful to wildlife. They also deprive us of one of the greatest sights in nature: the night sky. Light pollution is silent, tasteless and physically harmless, but it deserves much more attention from conservationists. The Moon can be big enough and bright enough not to be wholly drowned by it, but it’s lèse-majesté against the Queen of the Night all the same.

It also makes life much harder for amateur astronomers. Then again, perhaps that increases the rewards. And the Moon isn’t confined to the night sky, of course: you can observe it in full daylight using nothing more than binoculars. Serious observation demands a telescope, however, and Grego devotes a full section to what’s available. Inter alia, he himself has a “150mm f/8 achromatic refractor with digital camcorder setup with a zoom eyepiece for afocal video photography” (ch. 5, “Recording Your Observations”, pg. 144). Digital imaging and enhancement are now routine: modern technology can get “startling results from a seemingly mediocre video sequence” (pg. 146), sharpening and focusing blurred images.

But Grego and his fellow selenographers are still doing what Galileo, Thomas Harriot and other early astronomers did centuries ago: drawing and sketching the Moon. There’s a good practical reason to do this, as recent science-news has confirmed: “drawing pictures of information that needs to be remembered is a strong and reliable strategy to enhance memory”. There is a lot of detail to learn on the Moon. It’s a fractal place: there are craters at every scale, from the microscopic to hundreds-of-kilometres wide and “it is estimated that the Moon’s surface is studded with more than 3 trillion (3,000,000,000,000) craters larger than a metre in diameter” (pg. 9).

So learning your way around the Moon is a fractal process: first you learn to recognize the giant features, like Copernicus, Kepler and the maria (seas), montes (mountains) and valles (valleys), then you begin to fill in the gaps, then the gaps between the gaps, then the gaps between those. Grego supplies maps and commentary to help you on your way:

The polygonal crater Timaeus (33 km) perches on W. Bond’s south-western wall and surveys across the plains of Mare Frigoris across to the Montes Alpes, 175 km to the south. Archytas (32 km) and Protagoras (21) are two sharp-rimmed but somewhat misshapen craters whose dark shadow-filled eyes keep watch over the northern approaches of Mare Frigoris. (ch. 4, “Moonwatching”, Day seven, pg. 87)

He’s never finished learning about the Moon, however, and neither will anyone else. It’s a life-long adventure and although the Moon might seem cold and unchanging, at least over a human life-span, there are rare events called TLP, or “Transient Lunar Phenomena”, to look out for. These are “apparent obscurations, glows or flashes on the Moon’s surface” that don’t have definitive explanations. Are rocks collapsing? Is sublunar gas leaking out? Might there even be life there after all?

Life is highly doubtful, but Grego notes that “lunar topography is virtually neglected by professional astronomers” (pg. 6), so amateurs still have the chance to make important discoveries. This book might help someone to do that, but the rewards of selenoscopy don’t depend on advancing science or using clever technology. Grego opens the book by asking “Why Observe the Moon?”, then quotes an excellent answer to that question from the French astronomer Camille Flammarion and his book Astronomy for Amateurs (1903). What Flammarion said more than a century ago is still true today:

From all time the Moon has had the privilege of charming the gaze, and attracting the particular attention of mortals. What thoughts have not risen to her pale, yet luminous disk? Orb of mystery and of solitude, brooding over our silent nights, this celestial luminary is at once sad and splendid in her glacial purity, and her limpid rays provoke a reverie full of charm and melancholy. (“Why Observe the Moon?”, pg. 4)

In fact, you could say that the Moon is a touchstone of human nature. Chimpanzees and gorillas may be almost identical to us in their genes, but they don’t talk, make art or gaze at the Moon in wonder. We still do and although we don’t usually worship the Moon any more, we may owe it our very existence. How important have the tides been in the evolution of life on earth? They provided a zone of transition for the emergence of plants and animals from the sea, and perhaps a Moon-less Earth would also be a Man-less Earth.

But the Earth could have Moon without Man if it’s struck by an asteroid of sufficient size. The scars on the Moon’s surface should be constant reminders of the vigilance that’s necessary and the technology that we still need to develop. But the Moon is memento mori in more ways than one. Asteroid strikes are pinpricks by comparison with what may have happened to the Earth in the remote past:

Now widely accepted to be the most likely origin of the Moon is the giant impact or ‘big splash’ theory. This theory suggests that a Mars-sized planet (around half the size of the Earth) smashed into the young Earth, disintegrating the impactor and the Earth’s mantle at the site of impact. A cloud of debris was splashed into near-Earth orbit, and the outer rings of this temporary ring of material coalesced to form the Moon. (ch. 1, pg. 21)

As Sir Arthur Conan Doyle’s great character Professor Challenger pointed out in 1913: there are “many reasons why we should watch with a very close and interested attention every indication of change in those cosmic surroundings upon which our own ultimate fate may depend”. The Moon should frighten as well as awe and enchant us, or we might not survive to be awed and enchanted. This book will help you understand all these aspects of the Queen of the Night.

I also hope that Grego will write a sequel to it one day: Moon Tourist’s Guide. We’re still on schedule for at least some of the future envisaged by Arthur C. Clarke in his novel A Fall of Moondust (1961), which was set in the mid-twenty-first century. A moon-cruiser called Selene may not be sailing in a basin of dust as “fine as talcum-powder” by then, but there may still be lunar tourism. If so, selenographers like Peter Grego will be able to see close-up what they’ve long surveyed from afar.

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Front cover of The Cosmic Gallery by Giles Sparrow
The Cosmic Gallery: The Most Beautiful Images of the Universe, Giles Sparrow (Quercus 2013)

I’ve seen some of the images here on-line, but they’re better in a book. The resolution is higher and books satisfy the sense of touch and even the sense of smell in a way electronic media don’t and won’t for some time. You can leaf through The Cosmic Gallery, twist and turn the book as you please and enjoy the contrast between the ultra-modern photographs and the ancient way they are presented. The word “book” may be related to “beech”, because beeches have detachable bark that’s easy to write on. So The Cosmic Gallery combines past and present – and in more ways than one. The gorgeous star-fields here are records of not just of prehistory but of pre-humanity, because the light that made them had been travelling for millions of years when it was captured by human technology.

Some of star-photographs are so colourful and so full of grandeur, distance and antiquity that you can feel them growing like cathedrals in your head as you look at them. But their visual power isn’t accidental. These images aren’t intended purely as objective scientific records:

This book is in many ways a celebration of these amazing technological advances [in photography and computing] that have lately transformed our understanding of the universe. And yet we should not forget that the images on these pages are just as much a product of human artistry as the cave-paintings of Lascaux or the drawings of Lord Rosse [an Irish astronomer who made famous drawings of galaxies in the mid-nineteenth century]. Not only are these technical achievements an art in their own right, but also the representation of data gathered by a giant telescope or distant spacecraft is still ultimately a matter of human choice. Many of the images here make use of false or representative colours to highlight certain wavelengths or certain structures, or to bring entire invisible worlds within the narrow limits of our perception. (Introduction, pg. 11)

The star-photos are the most awe-inspiring and beautiful in the book. Some of the images from the solar system, being nearer to home and closer to the human scale, are almost domestic by comparison. But one of them reminds you of the vast scale of the solar system too: a now-famous shot of Saturn and its intricate halo of rings, taken by the Cassini probe as it looked sunward (pp. 148-9). To the left, “just inside the G ring at the ten o’clock position”, is a “pale blue dot”, easy to overlook, easy to ignore amid the splendour of the Saturnian rings. The dot is a planet called Earth, scene for all the horrors and heights of mankind. It’s a powerful reminder of how small we are even on a much-less-than-cosmic scale. But as C.S. Lewis pointed out: the ability to feel small is possible only to big creatures. Neither ants nor elephants are awed by the size, complexity and age of the universe, because neither ants nor elephants can appreciate them.

Nor can they appreciate the mathematics that permeates the universe and that ultimately is the universe. The patterns here are sometimes huge and spectacular, but the forces that shape dunes on Mar (pg. 86, 174) are shaping dunes on Earth too. And the unpredictability of a water-thread, falling, twisting and sputtering from a half-closed tap, is seen in Saturn’s chaotic satellite Hyperion, which has “no set rotation period, or even axis of rotation” (pg. 168). The swirl of colours in a close-up of Jupiter’s Great Red Spot (pp. 76-7) reminds me of swirling paint in a Francis Bacon; the “writhing mass of cells and tendrils” in sunspots (pg. 172) might almost be competing colonies of bacteria in a Petri dish, or even melted cheese on a pizza. From fire to ice, from dust to gas, from clouds to ultra-violet light, from sun-spots to melted cheese: Mathematica Magistra Mundi, Mathematics the Mistress of the World, oversees it all.

She also oversees the brains of the men – and it has been overwhelmingly men – responsible for designing and building the technology that has captured these images and brought them to the coffee-tables of the world. If we are here to go, as Brion Gysin claimed, then this book presents the looks before the leaps.

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