SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Solar system. Diagram of the solar system, based on the astronomical knowledge at the end of the 19th century. The Sun is at centre. The orbits of the planets out to Saturn are shown, as well as the asteroid belt (marked "minor planets) between Mars and Jupiter. The orbits of two comets are also shown, as well as the moons and rings of Jupiter and Saturn. The planetary orbits are to scale, though the orbits of the moons are not to scale. Two other planets had been discovered by this time (Uranus and Neptune), but are not shown. Halley's comet was identified as periodic in the 17th century. Faye's comet had been discovered more recently, in 1843. Artwork from Pioneers of Science (Oliver Lodge, 1893).
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