 View of Endurance from orbit. | |
| Planet | Mars |
|---|---|
| Region | Meridiani Planum |
| Coordinates | 1°54′S354°30′E / 1.9°S 354.5°E /-1.9; 354.5 |
| Quadrangle | Margaritifer Sinus |
| Diameter | 130 m[1] |
| Depth | Approx. 20 m (66 ft) |
| Discoverer | Opportunity rover |
| Eponym | The shipEndurance |
Endurance is animpact crater lying situated within theMargaritifer Sinus quadrangle (MC-19) region of the planetMars. This crater was visited by theOpportunity rover from May[2] until December 2004. Mission scientists named the crater after the shipEndurance that sailed to theAntarctic through theWeddell Sea during the ill-fated 1914–1917Imperial Trans-Antarctic Expedition, considered to be the last expedition of theHeroic Age of Antarctic Exploration organized byErnest Shackleton.
The rover entered the crater interior on its 134th missionsol (June 15), and exited on the 315th sol (December 14).[3] During this time it traversed various obstacles, steep inclines, and overcame large wheel slippage when driving over fine sand.
After arriving at the crater,Opportunity performed asurvey of the crater to plan the further steps in exploring thelocal geology. A site dubbed "Karatepe" was chosen to enter the crater and investigate the layering of thebedrock.
The picture to the right shows changes in the color of the bedrock layers. The layer "A" is closer to the rover and higher than the layers "B" to "E". Texture androck chemistry also differed with depth. Thus scientists infer that the age of these layers is following a similar pattern, with the higher layers being younger than the lower layers.[4]
Opportunity then went farther down into the crater to investigate the sand dunes. Various rock outcrops were investigated while the rover descended. It was decided not to drive into the dunes, for fear the rover might get stuck permanently. Instead,Opportunity did some work on some rocks surrounding the dunes before heading back up to the rim of the crater. On the way, it encountered a boulder, nicknamed 'Wopmay', that provided inconclusive evidence that rocks near the bottom of the crater were affected by water before and after the crater formed.
The rover then headed off to Burns Cliff. Burns Cliff, named for the late mineralogistRoger Burns ofMIT, was studied closely byOpportunity. High amounts of slippage prevented the rover from using its robotic arm, however high resolution imaging was conducted with the Pancam. It shows layers of sediment that might indicate deposition by a liquid. The layers in the cliff would later be followed south of the crater to identify it as ageologic formation, in this case the "Burns Formation". These names are not official until made so by theInternational Astronomical Union.
Burns Cliff was the final science stop inside Endurance. The rover had some trouble making it out, noticing slippage, but prevailed. Leaving Endurance it headed for itsheat shield where it would find theMeridiani Planum meteorite, which happened to be the first meteorite discovered on another planet.
Opportunity spent about half a year exploring Endurance. During that time, data collected by the rover supplanted and greatly expanded on thehistory of water at Meridiani Planum, in addition to the confirmation that there had been liquid water here in ancient times. Endurance provided mission scientists with a cross-section of the bedrock on this part of Mars, showing that liquid water hadn't flowed across the surface just once, but was of an episodic nature, and wasn't permanently present, with floods periodically washing over the landscape, and then drying up again. Interpretation of the materials (such assulfates) in Endurance'sevaporite outcrops led mission scientists to believe that this shallow sea was probably rather acidic in nature, but couldn't rule out that life may have been present at some point.
Features onMars visited byOpportunity | ||
|---|---|---|
| Craters |   | |
| Endeavour | ||
| Rocks(list) | ||
