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===Prehistory=== | ===Prehistory=== | ||
{{Main|Prehistoric human civilization|Erde-Tyrene civilization}} | {{Main|Prehistoric human civilization|Erde-Tyrene civilization}} | ||
It is believed that Earth first formed about 4.6 billion years ago, and gave rise to the first single-celled organisms about 3.9 billion years ago. Before the discovery of records of [[Ancient humanity|ancient spacefaring humans]], it was believed the ancestors of modern humans, "Homo sapiens", first evolved in [[Africa]] around 200,000 years ago. This date has recently been called into question largely thanks to the [[Halo: Cryptum|Bornstellar relation]], the remains of a deceased [[Catalog]] unit, and a damaged [[monitor]], which revealed that humanity achieved its earliest known spacefaring technological state prior to [[1,100,000 BCE]] and that Forerunners believed humans had "moved their interstellar civilization outward along the galactic arm" by [[150,000 BCE]]. Not only is the dating for humanity's origin less sure now, but the very idea of Earth has humanity's birthplace has also been revealed to have been a matter of debate for the civilization that preceded and witnessed the [[human-Forerunner wars]] and some Forerunners. That ancient empire had lost many of the records that could have proven or disproven the issue, and human ruins had also been discovered on multiple worlds beside Earth from forgotten eras of prehistory. Regardless of when and how humanity first evolved and developed, it is clear that humans were present on multiple planets over a million years ago, and it was not until thousands of years into this civilization that leading human scientists traced the species' origins to Earth.<ref name="pri238"/> | It is believed that Earth first formed about 4.6 billion years ago, and gave rise to the first single-celled organisms about 3.9 billion years ago. It was once speculated by the Librarian that the Precursors once visited Earth due to the mammalian-level intelligence exhibited by certain scyphozoa and cephalopoda on the planet during her research there which caused her to believe was evidence of experimentation by the Precursors. Before the discovery of records of [[Ancient humanity|ancient spacefaring humans]], it was believed the ancestors of modern humans, "Homo sapiens", first evolved in [[Africa]] around 200,000 years ago. This date has recently been called into question largely thanks to the [[Halo: Cryptum|Bornstellar relation]], the remains of a deceased [[Catalog]] unit, and a damaged [[monitor]], which revealed that humanity achieved its earliest known spacefaring technological state prior to [[1,100,000 BCE]] and that Forerunners believed humans had "moved their interstellar civilization outward along the galactic arm" by [[150,000 BCE]]. Not only is the dating for humanity's origin less sure now, but the very idea of Earth has humanity's birthplace has also been revealed to have been a matter of debate for the civilization that preceded and witnessed the [[human-Forerunner wars]] and some Forerunners. That ancient empire had lost many of the records that could have proven or disproven the issue, and human ruins had also been discovered on multiple worlds beside Earth from forgotten eras of prehistory. Regardless of when and how humanity first evolved and developed, it is clear that humans were present on multiple planets over a million years ago, and it was not until thousands of years into this civilization that leading human scientists traced the species' origins to Earth.<ref name="pri238"/> | ||
Spreading across the [[Orion Arm]] of the [[Milky Way|Milky Way Galaxy]], humanity underwent several periods of technological and social regression, losing most of their records in the process. Earth was one of the first human worlds to fall to the Forerunners in the [[human-Forerunner wars]].<ref name="Primordium"/> After being defeated by the Forerunner civilization, most humans were exiled to Earth, with their civilization dismantled, populations splintered amongst the many human species and their culture degrading back to a primitive state for millennia.<ref name="Cryptum"/> Earth and humanity came under the charge of the Forerunner [[Lifeshaper]], the [[Librarian]], who helped the humans slowly work towards rebuilding a primitive civilization. Remnants of their former technology, such as steam power and hot-air balloon flight, were re-learned under her care but later forgotten after the firing of the Halo Array.<ref name="Cryptum"/> | Spreading across the [[Orion Arm]] of the [[Milky Way|Milky Way Galaxy]], humanity underwent several periods of technological and social regression, losing most of their records in the process. Earth was one of the first human worlds to fall to the Forerunners in the [[human-Forerunner wars]].<ref name="Primordium"/> After being defeated by the Forerunner civilization, most humans were exiled to Earth, with their civilization dismantled, populations splintered amongst the many human species and their culture degrading back to a primitive state for millennia.<ref name="Cryptum"/> Earth and humanity came under the charge of the Forerunner [[Lifeshaper]], the [[Librarian]], who helped the humans slowly work towards rebuilding a primitive civilization. Remnants of their former technology, such as steam power and hot-air balloon flight, were re-learned under her care but later forgotten after the firing of the Halo Array.<ref name="Cryptum"/> | ||