Proving to be both varied and fascinating, moons are far more common than planets in our Solar System. Our own Moon has had a profound influence on Earth, not only through tidal effects, but even on the behaviour of some marine animals. Many remarkable things have been discovered about the moons of the giant outer planets from Voyager, Galileo, Cassini, and other spacecraft. Scientists have glimpsed volcanic activity on Io, found oceans of water on Titan, and captured photos of icy geysers bursting from Enceladus. It looks likely that microbial life beyond the Earth may be discovered on a moon rather than a planet.
In this Very Short Introduction David Rothery introduces the reader to the moons of our Solar System, beginning with the early discoveries of Galileo and others, describing their variety of mostly mythological names, and the early use of Jupiter's moons to establish position at sea and to estimate the speed of light. Rothery discusses the structure, formation, and influence of our Moon, and those of the other planets, and ends with the recent discovery of moons orbiting asteroids, whilst looking forward to the possibility of finding moons of exoplanets in planetary systems far beyond our own.
1: The discovery and significance of moons
2: The Moon
3: The Moon's influence on us
4: The moons of giant planets
5: Giant planet regular satellites in close up
6: The moons of Mars - captured asteroids
7: Moons of small bodies
8: Moons in other planetary systems: exomoons
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David Rothery is Professor of Planetary Geosciences at the Open University. During 1999-2004 he was Director of Teaching and Geosciences Programme Director in the former Department of Earth Sciences. He has also been Leader of the IAVCEI Commission on Remote Sensing, and in 2005 he was appointed to the PPARC Solar System Advisory Panel and the BepiColombo Oversight Committee. He is the lead academic (production) and Educator (presentation) for the Open University/FutureLearn Moons MOOC, and is the author of several books, including Satellites of the Outer Planets: Worlds in their Own Right, and Planets: A Very Short Introduction.