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2. List of programs broadcast by the History Channel - Wikipedia

   en.wikipedia.org/wiki/List_of_programs_broadcast...

   The Haunted History of Halloween; Heavy Metal; Heroes Under Fire; Hidden Cities; Hidden House History; High Hitler; High Points in History; Hillbilly: The Real Story; History Alive; History Films; History in Color; History Now; History of Angels [19] A History of Britain; A History of God [20] History of the Joke; The History of Sex; History ...

3. 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. [13] Most of the geologic record of this interval has been erased by subsequent erosion and high impact rates.

4. 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 ...

5. How the Universe Works - Wikipedia

   en.wikipedia.org/wiki/How_the_Universe_Works

   A two-hour episode examines what scientists have learned about M87*, the supermassive black hole in the supergiant elliptical galaxy Messier 87 (also known as Virgo A or NGC 4486). M87* is the first supermassive black hole photographed by the Event Horizon Telescope .

6. Ancient volcano on Mars once erupted for 2 billion years straight

   www.aol.com/news/2017-02-07-volcano-on-mars...

   If it feels like your week has been dragging on forever, consider this — a volcano on Mars once erupted for 2 billion years straight, which is nearly half of the planet's 4.5 billion-year lifetime.

7. 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]

8. Geology of solar terrestrial planets - Wikipedia

   en.wikipedia.org/wiki/Geology_of_solar...

   The geological history of Mars can be broadly classified into many epochs, but the following are the three major ones: Noachian epoch (named after Noachis Terra): Formation of the oldest extant surfaces of Mars, 3.8 billion years ago to 3.5 billion years ago. Noachian age surfaces are scarred by many large impact craters.

9. 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.