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Archive for the ‘The Moon’ Category

Moon: From 4.5 billion years ago to the present: Owners’ Workshop Manual, David M. Harland (Haynes 2016)

It was a clever idea: to put out a guide to the Moon in the same format as one of Haynes’ famous car-maintenance manuals. And the execution matched the idea. This is a detailed and interesting history of selenological speculation and lunar exploration, all the way from the ancient Greeks to the Apollo missions and beyond.

Except that there hasn’t been much beyond the Apollo missions. As the book’s final page notes:

On 31 December 1999 National Public Radio in the United States asked Sir Arthur C. Clarke, renowned for forecasting many of the developments of the 20th century, whether anything had happened in the preceding 100 years that he never could have anticipated. “Yes, absolutely,” he replied without a moment’s hesitation. “The one thing that I never would have expected is that after centuries of wonder and imagination and aspiration, we would have gone to the Moon… and then stopped.” (“Postscript”, pg. 172)

And we’ve been stopped for some time. Neil Armstrong died in 2012, forty-three years after that “small step for a man” and “giant leap for mankind” in 1969. But David M. Harland ends on an optimistic note: he thinks that “The Moon is humanity’s future.” It will be our gateway to the rest of the solar system and perhaps even the stars.

But it will be more than just a gateway. There is still a lot we don’t understand about our nearest celestial neighbour and big surprises may still be in store. One thing we do now understand is that the scarred and pitted lunar surface got that way from the outside, not the inside. That is, the moon was bombarded with meteors, not convulsed by volcanoes. But that understanding, so obvious in hindsight, took a long time to reach and it was actually geologists, not astronomers, who promoted and proved it (ch. 5, “The origin of lunar craters”). It was the last big question to be settled before the age of lunar exploration began.

Previously scientists had looked at the Moon with their feet firmly on the ground; at the end of the 1950s, they began to send probes and robotic explorers. Harland takes a detailed look at what these machines looked like, how they worked and where they landed or flew. Then came the giant leap: the Apollo missions. They were an astonishing achievement: a 21st-century feat carried out with technology from the 1960s, as Harland puts it. Yet in one way they depended on technology much earlier than the 1960s: pen and paper. The missions relied on the equations set out in Newton’s Principia Mathematica (1687). Newton had wanted to explain, inter multa alia, why the Moon moved as it did.

By doing that, he also explained where a spacecraft would need to be aimed if it wanted to leave the Earth and go into orbit around the Moon. His was a great intellectual achievement just as the Apollo missions were a great technological achievement, but he famously said that he was “standing on the shoulders of giants”. Harland begins the book with those giants: the earlier scientists and mathematicians who looked up in wonder at the Moon and tried to understand its mysteries. Apollonius, Hipparchus and Ptolemy were giants in the classical world; Galileo, Brahe and Kepler were giants in the Renaissance. Then came Newton and the men behind the Apollo missions.

Are there more giants to come? The Moon may be colonized by private enterprise, not by a government, so the next big names in lunar history may be those of businessmen, not scientists, engineers and astronauts. But China, India and Japan have all begun sending probes to the Moon, so their citizens may follow. Unless some huge disaster gets in the way, it’s surely only a matter of time before more human beings step onto the lunar surface. Even with today’s technology it will be a great achievement and more reason to marvel at the Apollo missions. And the Apollo photographs still look good today.

There are lots of those photographs here, with detailed discussion of the men and machines that allowed them to be taken. The Moon is a fascinating place and this is an excellent guide to what we’ve learned and why we need to learn more.

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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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