{"id":150666,"date":"2022-11-21T07:59:07","date_gmt":"2022-11-21T13:59:07","guid":{"rendered":"https:\/\/lifeboat.com\/blog\/2022\/11\/ancestor-of-all-life-on-earth-evolved-earlier-than-we-thought-according-to-our-new-timescale"},"modified":"2022-11-21T07:59:07","modified_gmt":"2022-11-21T13:59:07","slug":"ancestor-of-all-life-on-earth-evolved-earlier-than-we-thought-according-to-our-new-timescale","status":"publish","type":"post","link":"https:\/\/lifeboat.com\/blog\/2022\/11\/ancestor-of-all-life-on-earth-evolved-earlier-than-we-thought-according-to-our-new-timescale","title":{"rendered":"Ancestor of all life on Earth evolved earlier than we thought, according to our new timescale"},"content":{"rendered":"

<\/a><\/p>\n

Microbial life may have resided within the first four kilometers of Mars\u2019s porous crust.<\/p>\n

Four billion years ago, the solar system was still young. Almost fully formed, its planets were starting to experience asteroid strikes a little less frequently. Our own planet could have become habitable as long as 3.9 billion years ago<\/a>, but its primitive biosphere was much different than it is today. Life had not yet invented photosynthesis<\/a>, which some 500 million years later would become its main source of energy. The primordial microbes \u2014 the common ancestors to all current life forms on Earth \u2014 in our planet\u2019s oceans, therefore, had to survive on another source of energy. They consumed chemicals released from inside the planet through its hydrothermal systems and volcanoes, which built up as gas in the atmosphere<\/a>.<\/p>\n

Some of the oldest life forms in our biosphere were microorganisms known as \u201chydrogenotrophic methanogens\u201d<\/a> that particularly benefited from the atmospheric composition of the time. Feeding on the CO2 (carbon dioxide) and H2 (dihydrogen) that abounded in the atmosphere (with H2 representing between 0.01 and 0.1% of the atmospheric composition, compared to the current approximate of 0.00005%), they harnessed enough energy<\/a> to colonize the surface of our planet\u2019s oceans. we explore Mars, it is becoming clearer that similar environmental conditions were developing on its surface at the same time as those that enabled methanogens to flourish in the oceans back on Earth.<\/p>\n","protected":false},"excerpt":{"rendered":"

Microbial life may have resided within the first four kilometers of Mars\u2019s porous crust. Four billion years ago, the solar system was still young. Almost fully formed, its planets were starting to experience asteroid strikes a little less frequently. Our own planet could have become habitable as long as 3.9 billion years ago, but its [\u2026]<\/p>\n","protected":false},"author":578,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1527,19],"tags":[],"class_list":["post-150666","post","type-post","status-publish","format-standard","hentry","category-alien-life","category-chemistry"],"_links":{"self":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/150666","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/users\/578"}],"replies":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/comments?post=150666"}],"version-history":[{"count":0,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/150666\/revisions"}],"wp:attachment":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/media?parent=150666"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/categories?post=150666"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/tags?post=150666"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}