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This trope has its roots in a 19th Century theory that the planets were formed in reverse order to their proximity to the sun, gradually moving further from the source as they aged. Therefore, Mars was seen as an old, dried-up world whose best days were behind it. This same theory also gave rise to the trope of [[VenusIsWet Venus as a youthful and fecund planet]].
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* Orthopox's exposition in the beginning of ''VideoGame/DestroyAllHumans'' states that when the Furons visited on Earth in ancient times to, err... ''[[MarsNeedsWomen relieve stress]]'' with early humans, they had just finished eradicating the Martians.
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* Orthopox's exposition in the beginning of ''VideoGame/DestroyAllHumans'' states that when the Furons visited on Earth in ancient times to, err... ''[[MarsNeedsWomen relieve stress]]'' with early humans, they had just finished eradicating the Martians. ''VideoGame/DestroyAllHumans2'' elaborates that Mars used to be a full-on ocean world, until it was reduced to a barren wasteland by Furon weaponry. [[spoiler:The main antagonists of the second game are lobster-like Martian remnants plotting to perform HostileTerraforming on the Earth]].
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* In ''[[Franchise/{{Quatermass}} Quatermass and the Pit]]'' (U.S. title, ''Five Million Years to Earth''), Professor Quatermass theorizes that a discovered spacecraft, with corpses of insectoid-beings within, originated from the now "dead" planet Mars, five million years ago when... "''Mars must have been teeming with life''," and even been highly advanced scientifically. But, the Martians "''...realized their planet was doomed''," and sought to preserve what they could of themselves by establishing a "colony by proxy" on Earth.
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* ''Literature/TheSwordOfRhiannon'': Present-day Mars is a desert planet (although the canals are water-filled) inhabited by HumanAlien Martians, but a million years ago Mars was much warmer, with extensive oceans.
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* ''Literature/TheSwordOfRhiannon'': Present-day Mars is a desert planet (although the canals are water-filled) inhabited by HumanAlien {{Human Alien|s}} Martians, but a million years ago ago, Mars was much warmer, with extensive oceans.
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What ''is'' known about Mars that aligns with this trope is that flowing water almost certainly existed there on a grand scale early on in its history. Billions of years ago, when Mars's volcanism still flourished, areas of liquid water spanned the soon-to-be-Red Planet's surface, carving out features such as lakes, rivers and deltas. Recent studies have even found evidence that Mars still has some standing water on it, though not on the surface; below the crust around Mars's south polar ice caps - composed largely of carbon dioxide and water ice - is a system of subterranean lakes containing salty water. While one prominent theory argues that Mars’s water evaporated into space, analysis of Martian rocks has suggested that the majority of Mars's water is actually still on Mars, but has been sequestered into the planet's rocks and crust, contained within hydrated minerals over the ensuing aeons. The presence on Mars of certain minerals that outright require water to be present to form, such as [[https://mars.nasa.gov/resources/642/gemstone-of-the-year-labeled/ opals]] (a hydrated amorphous form of silica) certainly lend credence to this idea.
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What ''is'' known about Mars that aligns with this trope is that flowing water almost certainly existed there on a grand scale early on in its history. Billions of years ago, when Mars's volcanism still flourished, areas of liquid water spanned the soon-to-be-Red Planet's surface, carving out features such as lakes, rivers and deltas. Recent studies have even found evidence that Mars still has some standing water on it, though not on the surface; below the crust around Mars's south polar ice caps - -- composed largely of carbon dioxide and water ice - -- is a system of subterranean lakes containing salty water. While one prominent theory argues that Mars’s water evaporated into space, analysis of Martian rocks has suggested that the majority of Mars's water is actually still on Mars, but has been sequestered into the planet's rocks and crust, contained within hydrated minerals over the ensuing aeons. The presence on Mars of certain minerals that outright require water to be present to form, such as [[https://mars.nasa.gov/resources/642/gemstone-of-the-year-labeled/ opals]] (a hydrated amorphous form of silica) certainly lend credence to this idea.
