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Thalassa(thəlăs`ə, thăl`əsə), in astronomy, one of the natural satellites, or moons, of NeptuneNeptune,
in astronomy, 8th planet from the sun at a mean distance of about 2.8 billion mi (4.5 billion km) with an orbit lying between those of Uranus and the dwarf planet Pluto; its period of revolution is about 165 years.
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Thalassa(thă-lass -ă) A small satellite of Neptune, discovered by Voyager 2 in 1989. See Table 2, backmatter.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
A satellite of Neptune orbiting at a mean distance of 31,000 miles (50,000 kilometers) with a period of 7.5 hours, and with a diameter of about 50 miles (80 kilometers).
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.