English example sentences with "outermost"

One night in 1572, Danish astronomer Tycho Brahe saw what he thought was a brilliant new star in the constellation Cassiopeia. (We now know he was observing a supernova.) In 1604, a second supernova was observed. These discoveries caused scientists to seriously question Ptolemy's theory that all stars were contained in an outermost sphere of the universe that never changed.
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The exosphere is the outermost layer of our atmosphere.
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Callisto, the outermost of the four Galilean moons, has an old surface that is perhaps the most heavily cratered of any object in the solar system.
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The Sun's corona is the outermost part of the Sun's atmosphere.
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Pluto was called a planet from 1930 to 2006, when it was demoted because there appeared to be other bodies similar to Pluto orbiting beyond it, making Neptune the outermost planet.
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