Thalassa is one of the inner moons of Neptune, discovered in September 1989 from images taken by the Voyager 2 spacecraft as it approached the planet. It orbits close to Neptune, just inside the orbit of the larger moon Larissa, and is a small, irregular object with a diameter of roughly eighty kilometers. Like the other inner moons, it was only resolved as more than a dot in the Voyager 2 images, and little is known about its surface. It is named after the Greek goddess personifying the sea, in keeping with the practice of naming Neptune's satellites after sea gods and nymphs.
Before and after
- 23 August 1989Baltic Way
- 25 August 1989Voyager 2 flies past Neptune
- 13 September 1989Birth of Thomas Müller
- 18 September 1989Discovery of Naiad
- 18 September 1989Discovery of Thalassa
- 22 September 1989Founding of International Paralympic Committee
- 28 September 1989Death of Ferdinand Marcos
- 1 October 1989Birth of Brie Larson
- 13 October 1989Birth of Alexandria Ocasio-Cortez
More in Universe & space
- 1 May 1949Discovery of Nereid
- 20 August 1977Launch of Voyager 2
- 28 July 1989Discovery of Galatea
- 23 July 1995Discovery of Comet Hale-Bopp
- 15 May 2005Discovery of Hydra
- 10 September 2005Discovery of Dysnomia
The era
This moment belongs to the Contemporary world (1945 CE to today), the world since 1945. You can also browse everything in the 20th century.