Tethys

Definitions: Tethys

Tethys

Noun

1. (Greek mythology) a Titaness and sea goddess; wife of Oceanus.

2. Type genus of the family Aplysiidae.

Date "Tethys" was first used in popular English literature: sometime before 1596. (references)

Etymology: Tethys \Te"thys\, noun. [New Latin expression, from the Greek expression an oyster, or kind of ascidian.]. (Websters 1913)

Domain	Definitions
Aerospace	A satellite of Saturn orbiting at a mean distance of 295,000 kilometers. (references)
Source: compiled by the editor from various references; see credits.

Tethys the titanessess of Greek mythology
Tethys the natural satellite of Saturn

Tethys (moon)

(From Wikipedia, the free Encyclopedia)

Tethys

larger version

Discovery

Discovered by

Giovanni Cassini

Discovered in

1684

Orbital characteristics

Semimajor axis

294,660 km

Eccentricity

0.000

Orbital period

45h 18m 26s

Inclination

1.09°

Is a satellite of

Saturn

Physical characteristics

Mean radius

530 km

Mass

6.176×10²⁰ kg

Mean density

0.99 g/cm³

Surface gravity

0.16 m/s²

Rotation period

45h 18m 26s (synchronous)

Axial tilt

0.034°

Albedo

0.8

Surface temp

min	mean	max
? K	86 K	? K

Atmosphere

none

Tethys is a moon of Saturn that was discovered by Giovanni Cassini in 1684.

Tethys is an icy body similar in nature to Dione and Rhea. The density of Tethys is 1.21 g/cm³, indicating that it is composed almost entirely of water-ice. Tethys's surface is heavily cratered and contains numerous cracks caused by faults in the ice. There are two different types of terrain found on Tethys, one composed of densely cratered regions and the other consisting of a dark colored and lightly cratered belt that extends across the moon. The light cratering of this second region indicates that Tethys was once internally active, causing parts of the older terrain to be resurfaced.

The exact cause of the darkness of the belt is unknown but a possible interpretation comes from recent Galileo probe images of Jupiter's moons Ganymede and Callisto, both of which exhibit light polar caps that are made from bright ice deposits on pole-facing slopes of craters. From a distance the caps appear brighter due to the thousands of unresolved ice patches in small craters present there. Tethys' surface may have been formed in a similar manner, consisting of hazy polar caps of unresolved bright ice patches with a darker zone in between.

The western hemisphere of Tethys is dominated by a huge impact crater called Odysseus, whose 400 km diameter is nearly 2/5 of that of Tethys itself. The crater is now quite flat (or more precisely, it conforms to Tethys' spherical shape), like the craters on Callisto, without the high ring mountains and central peaks commonly seen on the Moon and Mercury. This is most likely due to the slumping of Tethys' weak icy crust over geologic time.

The second major feature seen on Tethys is a huge valley called Ithaca Chasma, 100 km wide and 3 to 5 km deep. It runs 2000 km long, approximately 3/4 of the way around Tethys' circumference. It is thought that Ithaca Chasma formed as Tethys' internal liquid water solidified, causing the moon to expand and cracking the surface to accommodate the extra volume within. Earlier craters from before Tethys solidified were probably all erased by geological activity before then. There is another theory about the formation of Ithica Chasma: when the impact that caused the great crater Odysseus occurred, the shockwave traveled through Tethys and fractured the icy, brittle surface on the other side. Tethys' surface temperature is -187°C.

The co-orbital moons Telesto and Calypso are located within Tethys' Lagrangian points L₄ and L₅, 60 degrees ahead and behind Tethys in its orbit respectively.

Tethys (mythology)

(From Wikipedia, the free Encyclopedia)

In Greek mythology, Tethys was a Titanessess and sea goddess who was both sister and wife of Oceanus. Together, they had the three-thousand Oceanids.

During the war against the Titans, Tethys raised Rhea, her god-child.

Hera was not please with the placement of Callisto and Arcas in the sky, as the constellations Ursa Major and Ursa Minor, so she asked her nurse, Tethys, to help. Tethys, a marine goddess, cursed the constellations to forever circle the sky and never drop below the horizon, hence explaining why they are circumpolar.

Consorts/Children

With Oceanus
1. Achelous
2. Acheron
3. Alpheus
4. Amaltheia
5. Amphitrite
6. Asia
7. Asopus
8. Callirhoe
9. Catillus
10. Cebren
11. Cephissus
12. Circe
13. Clitunno (Roman mythology)
14. Clymene
15. Crinisus
16. Dione
17. Doris
18. Electra
19. Enipeus
20. Eurynome
21. Inachus
22. Lysithea
23. Melia
24. Meliboea
25. Merope
26. Nilus
27. Peneus
28. Perse
29. Philyra
30. Pleione
31. Rhode
32. Scamander
33. Telesto
34. Tiberinus (Roman mythology)
35. Tibertus (Roman mythology)
36. Tyche
37. Volturnus (Roman mythology)

Synonyms: Tethys

Synonyms: genus Aplysia (n), genus Tethus (n). (additional references)

Crosswords: Tethys

English words defined with "Tethys": Oceanid. (references)

Specialty definitions using "Tethys": I'sis ♦ Sea Deities. (references)

Etymologies containing "Tethys": Tethydan, Tethyodea. (references)

Domain	Title
References	Tethys Energy Inc: International Competitive Benchmarks and Financial Gap Analysis (reference) (more reference examples)

Books	Permo-Triassic Events in the Eastern Tethys : Stratigraphy Classification and Relations with the Western Tethys (reference) The Evolution of the Tethys in China and Adjacent Regions (reference) (more book examples)
Source: compiled by the editor from various references; see credits.

Thumbnail	Description & Credit	Thumbnail	Description & Credit
	Montage of Saturn and several of its satellites, Dione, Tethys, Mimas, Enceladus, Rhea, and Titan.Credit: NASA.		Color image of Saturn's satellite, Tethys.Credit: NASA.
Source: compiled by the editor from various references; see credits.

"Tethys" is generally used as a noun (proper) -- approximately 55.56% of the time. "Tethys" is used about 9 times out of a sample of 100 million words spoken or written in English. Its rank is based on over 700,000 words used in the English language. Some parts-of-speech are not covered due to the samples used by the British National Corpus. (note: percents less than one-hundredth of one percent have been omitted)

Parts of Speech	Percent	Usage per 100 Million Words	Rank in English
Noun (proper)	55.56%	5	157,705
Noun (plural)	44.44%	4	175,879
Total	100.00%	9	N/A

Country	Name
Canada	Tethys Energy Inc
	(more examples...)

Hypenated Usage
	Ending with "Tethys": Palaeo-tethys.
Source: compiled by the editor from various references; see credits.

The following statistics estimate the number of searches per day across the major English-language search engines as identified by various trade publications. Hyperlinks lead to commercial use of the expression at Amazon.com.

Language		Translations for "Tethys"; alternative meanings/domain in parentheses.
French		Téthys. (various references)

Pig Latin		ethystay
Source: compiled by the editor from various translation references.

Words rhyming with "Tethys" (pronounced 'Te"thys'): Dinichthys, Ichthys, Pterichthys. (additional references)

Scrabble® Enable2K-Verified Anagrams
	Direct Anagrams: tythes.
	Words within the letters "e-h-s-t-t-y"
	-1 letter: testy, teths, tythe, yetts.
	-2 letters: eths, hest, hets, hyte, sett, stet, stey, stye, test, teth, tets, they, tyes, yett.
	-3 letters: eth, hes, het, hey, set, she, shy, sty, tet, the, thy, tye, yeh, yes, yet.
	-4 letters: eh, es, et, he, sh, ye.
	Words containing the letters "e-h-s-t-t-y"
	+2 letters: amethyst, mythiest, stealthy, stretchy, thymiest.
	+3 letters: amethysts, ethylates, pettishly, prettyish, stitchery, synthetic, trachytes.
	+4 letters: athrocytes, erythrites, hesitantly, heterocyst, histiocyte, hypertexts, hysteretic, methylates, nymphettes, osteopathy, polytheist, stealthily, strathspey, synthesist, synthetase, synthetics, thymocytes.
	+5 letters: amethystine, erythristic, hepatocytes, heterocysts, histiocytes, hyperstatic, hypostatize, hysterotomy, kittenishly, lithophytes, methylators, photosystem, phytosterol, polytheists, pyrrhotites, strathspeys, sympathetic, synesthetic, synthesists, synthetases, toothsomely, yesternight.
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