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7 total sentences available.
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.
Source: tatoeba (3957936)
The exosphere is the outermost layer of our atmosphere.
Source: tatoeba (5322372)
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.
Source: tatoeba (6294005)
The Sun's corona is the outermost part of the Sun's atmosphere.
Source: tatoeba (8838642)
Showing 4 of 7 available sentences.