Wikipedia
Thalassa may refer to:
- Thalassa (mythology) ("sea"), a primordial Greek sea goddess
- Thalassa (moon), a moon of the planet Neptune
- Thalassa, a fictional planet (a waterworld) in Arthur C. Clarke's novel The Songs of Distant Earth
- Thalassa (genus), a genus of ladybug
- Thalassa (poem), the title of a late poem written by Louis MacNeice
- Thalassa (band), a band which represented Greece at the Eurovision Song Contest 1998
- Thalassa (TV series), a French documentary programme
- Thalassa (book), a book by psychoanalyst Sándor Ferenczi
- RV , a ship of the Ifremer.
- Thalassa (tall ship), a barquentine sailing ship from the Netherlands
- Thalassa sea & spa, a chain of thalassotherapy spas owned by French hotel group Accor
- Thalassa (fictional character), one of three remaining incorporeal members of a society of alien beings from the Star Trek original series episode " Return to Tomorrow"
- Thalassa Gramarye, a fictional musician in the Ace Attorney video game series, appearing in Apollo Justice: Ace Attorney
Thalassa ( ; Greek: Θάλασσα), also known as Neptune IV, is the second innermost satellite of Neptune. Thalassa was named after sea goddess Thalassa, a daughter of Aether and Hemera from Greek mythology. "Thalassa" is also the Greek word for " sea".
Thalassa was discovered sometime before mid-September 1989 from the images taken by the Voyager 2 probe. It was given the temporary designation S/1989 N 5. The discovery was announced (IAUC 4867) on September 29, 1989, but the text only talks of "25 frames taken over 11 days", giving a discovery date of sometime before September 18. The name was given on 16 September 1991.
Thalassa is irregularly shaped and shows no sign of any geological modification. It is likely that it is a rubble pile re-accreted from fragments of Neptune's original satellites, which were smashed up by perturbations from Triton soon after that moon's capture into a very eccentric initial orbit. Unusually for irregular bodies, it appears to be roughly disk-shaped.
Since the Thalassian orbit is below Neptune's synchronous orbit radius, it is slowly spiralling inward due to tidal deceleration and may eventually impact Neptune's atmosphere, or break up into a planetary ring upon passing its Roche limit due to tidal stretching. Relatively soon after, the spreading debris may impinge upon Despina's orbit.
Thalassa is a French documentary television series shown every Friday at 8:45pm on France 3. The documentary is presented by Georges Pernoud and is produced by France Télévisions. It is entirely focused on the sea (θάλασσα, thálassa in Ancient and Modern Greek) – geography, ecology, fishing, transportation, and yachting.
It is one of the oldest French TV series still running (together with Des chiffres et des lettres). It started on September 27, 1975 and is still one of the most prominent TV programmes in France.
Thalassa represented Greece in the Eurovision Song Contest 1998. They performed the song " Mia Krifi Evesthisia".