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The Voyager imaging team asked for the photo to show Earth’s vulnerability — to illustrate how small, fragile and irreplaceable it is on a cosmic scale. The crater is now quite flat – more precisely, its floor conforms to Tethys's spherical shape.

In addition, it has much in common with two of its Cronian peers, Mimas and Rhea, which also resemble a certain moon-size space station. Ithaca Chasma may have been caused by expansion of internal liquid water as it froze into ice after the surface had already frozen. [35], The Cassini spacecraft entered orbit around Saturn in 2004. During its primary mission from June 2004 through June 2008 it performed one very close targeted flyby of Tethys on 24 September 2005 at the distance of 1503 km. An alternate theory is that the impact that created the Odysseus Crater also generated forces that created Ithaca Chasma, especially since the chasm is on the opposite side of Tethys from the Odysseus Crater. NASA's Mars Odyssey spacecraft has captured these six infrared views of the Martian moon Phobos.

Like all other regular moons of Saturn, Tethys is believed to have formed from the Saturnian sub-nebula – a disk of gas and dust that surrounded Saturn soon after its formation. Click here to sign in with Tethys' density is 0.97 times that of liquid water, which suggests that Tethys is composed almost entirely of water ice plus a small amount of rock.

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[50], One year later, on 12 November 1980, Voyager 1 flew 415,670 km from Tethys. Although both Voyager spacecraft took images of the surface, only those taken by Voyager 2 were of high enough resolution to truly map the surface. Tethys has two overpowering features, a giant impact crater and a great valley. Tethys is also subject to constant bombardment by the energetic particles (electrons and ions) present in the magnetosphere. The photo of Saturn's moon Tethys was taken on April 14, 2012 and received on Earth April 15, 2012. At average temperatures of minus 187 degrees C (minus 305 degrees F), the ice on the lunar surface responds much like rock. Solar System Dynamics.

Cassini referred to Tethys as one of the four Sidera Lodoicea (Stars of Louis) after King Louis XIV (the other three were Iapetus, Dione and Rhea).

[43], The extremely water-ice-rich composition of Tethys remains unexplained. Tethys (/ˈtiːθɪs, ˈtɛθɪs/), or Saturn III, is a mid-sized moon of Saturn about 1,060 km (660 mi) across. The camera was pointing toward Tethys at approximately 185 kilometers away, and the image was taken using the CL1 and CL2 filters.

Separately, a 2016 presentation at the American Astronomical Societysuggested some craters on Tethys (and other moons) could have been from leftover debris from a previous generation of moons.

Tethys has no atmosphere, and keeps one face perpetually pointed toward its parent planet. [41], Tethys is thought to have formed from an accretion disc or subnebula; a disc of gas and dust that existed around Saturn for some time after its formation.

The chasm and surrounding area are heavily cratered, indicating that it was formed long ago.

Whether you're doing it for the nerd cred or the pie, this week on #10Things, we've got all the ways you can celebrate #PiDay with NASA.

Mythical Facts about Tethys Fact 1: Tethys took the side of the Titans in the War of the Titans Fact 2: She raised and educated Hera, the Queen of the Olympian gods, as her step-child Fact 3: A moon of the planet Saturn is named after the goddess

This refers to the Inclination of the object. The larger an object is, the more velocity (speed) is needed to break free from the object.The Semi-Major Axis of the orbit is 294.66, which is the furthest point from the centre to the edge of an elliptical point. Originally discovered by Giovanni Cassini in 1684, Tethys is one of four moons discovered by the great Italian mathematician, astronomer, astrologer and engineer between the years of 1671 and 1684.

It is 62 miles wide, 2 to 3 miles deep, and extends 1,200 miles (100 kilometers, 3 to 5 kilometers, and 2,000 kilometers, respectively). Scientists think that electrons bombarding the leading face of the satellite could have turned the region into hard-packed ice that changes temperature more slowly than the rest of the moon. You can be assured our editors closely monitor every feedback sent and will take appropriate actions. The band has an elliptical shape getting narrower as it approaches the trailing hemisphere, which is similar to the one found on Mimas. Tethys [TETH-iss] is the ninth of Saturn's known moons and is the fifth largest. The content is provided for information purposes only. [16] By the end of the seventeenth century, astronomers fell into the habit of referring to them and Titan as Saturn I through Saturn V (Tethys, Dione, Rhea, Titan, Iapetus). Tethys’ orbit lies deep inside the magnetosphere of Saturn, which means that the plasma co-rotating with the planet strikes the trailing hemisphere of the moon. Credit: NASA/JPL/USGS/Tom Reding [26] No compound other than crystalline water ice has been unambiguously identified on Tethys. Tethys is also subject to constant bombardment by the energetic particles (electrons and ions) present in the magnetosphere.

Tethys has a high reflectivity (or visual albedo) of 1.229 in the visual range, again suggesting a composition largely of water ice, which would behave like rock in the Tethyan average temperature of -305 degrees Fahrenheit (-187 degrees Celsius). Composition and Surface Features: At the time of their discovery, he named the four new moons "Sider Lodoicea" ("the stars of Louis") in honor of his patron, king Louis XIV of France.

The second major feature, a valley called Ithaca Chasma (named for the country ruled by Odysseus), runs roughly from the Tethyan north pole to its south pole.

Our image of the day, Average orbit around Saturn: 183,100 miles (294,672 km), Closest approach: 183,083 miles (294,643 km), Equatorial circumference: 2081 miles (3,349 km). Another possible explanation is that the surface froze before the interior, leading to an expansion that cracked the crust.

The orbital inclination, the angle at which Tethys orbits in relation to the orbital plane is 1.86 degrees. Tethys (or Saturn III) is a mid-sized moon of Saturn about 1,060 km (Template:Convert/round mi) across.

Tethys was discovered by Giovanni Domenico Cassini in 1684 together with Dione, another moon of Saturn. While Voyager 1 managed to capture an image of Ithaca Chasma, it was the Voyager 2 mission that revealed much about the surface and imaged the Odysseus crater.

Due to its position, shape, and the fact that a section in the middle is raised, this crater is also responsible for lending the moon it’s “Death Star” appearance.