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  2. Geological history of Mars - Wikipedia

    en.wikipedia.org/wiki/Geological_history_of_Mars

    Pre-Noachian: the interval from the accretion and differentiation of the planet about 4.5 billion years ago to the formation of the Hellas impact basin, between 4.1 and 3.8 Gya. [14] Most of the geologic record of this interval has been erased by subsequent erosion and high impact rates.

  3. Mars - Wikipedia

    en.wikipedia.org/wiki/Mars

    A 2023 study shows evidence, based on the orbital inclination of Deimos (a small moon of Mars), that Mars may once have had a ring system 3.5 billion years to 4 billion years ago. [32] This ring system may have been formed from a moon, 20 times more massive than Phobos, orbiting Mars billions of years ago; and Phobos would be a remnant of that ...

  4. Common surface features of Mars - Wikipedia

    en.wikipedia.org/.../Common_surface_features_of_Mars

    Chaos regions formed long ago. By counting craters (more craters in any given area means an older surface) and by studying the valleys' relations with other geological features, scientists have concluded the channels formed 2.0 to 3.8 billion years ago. [51]

  5. 7 amazing facts about Mars - AOL

    www.aol.com/news/2016-09-15-7-amazing-facts...

    Did you know Mars is named after the Roman god of war?

  6. Life on Mars - Wikipedia

    en.wikipedia.org/wiki/Life_on_Mars

    At least two-thirds of Mars' surface is more than 3.5 billion years old, and it could have been habitable 4.48 billion years ago, 500 million years before the earliest known Earth lifeforms; [4] Mars may thus hold the best record of the prebiotic conditions leading to life, even if life does not or has never existed there. [5] [6]

  7. 7 amazing facts about Mars - AOL

    www.aol.com/.../7-amazing-facts-about-mars/21473000

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  8. Mars carbonate catastrophe - Wikipedia

    en.wikipedia.org/wiki/Mars_carbonate_catastrophe

    The Mars carbonate catastrophe was an event that happened on Mars in its early history. Evidence shows Mars was once warmer and wet about 4 billion years ago, that is about 560 million years after the formation of Mars. Mars quickly, over a 1 to 12 million year time span, lost its water, becoming cold and very dry.

  9. Magnetic field of Mars - Wikipedia

    en.wikipedia.org/wiki/Magnetic_field_of_Mars

    The magnetic field of Mars is the magnetic field generated from Mars's interior. Today, Mars does not have a global magnetic field. However, Mars did power an early dynamo that produced a strong magnetic field 4 billion years ago, comparable to Earth's present surface field. After the early dynamo ceased, a weak late dynamo was reactivated (or ...

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