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Meridiani Planum
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Mars
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Meridiani Planum

region, Mars
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Mars
Mars A portion of rock outcropping within a small crater in the Meridiani Planum region of Mars, shown in an image made by the Mars Exploration Rover Opportunity in late January 2004. The outcropping varies in height from 30 to 45 cm (12 to 18 inches) along the crater. As interpreted by rover mission scientists, the rock layers apparently were laid down as deposits at the bottom of a body of flowing saltwater, probably on the shoreline of an ancient salty sea.

Meridiani Planum is a region on Mars characterized by its relatively smooth, sparsely cratered plains. This area, along with others like Chryse Planitia and Utopia Planitia, forms the low-lying northern hemisphere of Mars, contrasting with the heavily cratered southern highlands. The plains are thought to be composed of lava flows and younger materials that formed after the decline in asteroid impacts, roughly 3.8 to 3.5 billion years ago.1

The Mars Exploration Rover Opportunity landed in Meridiani Planum in January 2004. Its mission was to analyze the geology and search for evidence of past water. Opportunity found rocks that indicated the area was once the shoreline of an ancient body of salty water. This discovery provided significant evidence for the presence of liquid water on Mars in its past.23

Summary created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
10 Britannica Sources
  1. Mars - Sparsely cratered plains
  2. Mars - Surface composition
  3. extraterrestrial life - Martian “vegetation” and “canals”
  4. Mars - The question of life on Mars
  5. Mars - Spacecraft exploration
  6. Mercury - Mariner 10, radar, and Messenger
  7. Mars - Southern cratered highlands
  8. All 81 References in Fall Out Boy’s “We Didn’t Start the Fire,” Explained - Mars rover
  9. Mars - Valles Marineris
  10. space exploration - Solar system exploration

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