Jefferis, David

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jefferisdavid

Gas giants

huge far off worlds
Presents an illustrated discussion of Uranus and Neptune, covering their temperatures, moons, rings, rotation, and more, and includes information about the Keck observatory and online sources for viewing the night sky.
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Galaxies

immense star islands
Provides an introduction to galaxies, answering questions about what they are, where they come from, the Milky Way, the galactic halo, galaxy collisions, and related topics.
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Star spotters

telescopes and observatories
Provides an introduction to telescopes and observatories, answering questions about the history of star spotting, how light travels through space, how optical telescopes work, x-ray astronomy, and related topics.
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Space probes

exploring beyond Earth
An introduction to space probes, answering questions about uncrewed spacecraft, the history of probes, how they work, various missions, and related topics.
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Robot warriors

An introduction to robot warriors, discussing the development of automated fighting machines, the use of robots to perform dangerous tasks in space, in the air, on land, and at sea, and the possible future of robot technology.
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Mighty megaplanets

Jupiter and Saturn
Presents an illustrated discussion of the megaplanets Jupiter and Saturn, covering their various features such as spots, rings, shepherd moons, and high winds, and discusses how to observe the planets with basic equipment.
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The stars

glowing spheres in the sky
An introduction to the stars, answering questions about what stars are and how they form, different types of stars, constellations, supernovas, black holes, star spotting, and related topics.

The sun

Provides answers to questions about the sun, such as how old it is, of what it is made, and the size of a prominence.

Mars

Provides answers to questions about Mars, such as why it is called the red planet, the depth of Martian valleys, and how it can be observed.

Robot voyagers

An introduction to robot voyagers, discussing the origins of explorer robots, looking at how their technology enables them to roll, crawl, walk, and venture into dangerous and/or difficult places, and considering the possible future of robot exploration.

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