Science #humanevolution

Science #humanevolution

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This video sits under the TikTok hashtag #science, a theme with strong pull in humanities and technology content. We group videos from the same hashtag so you can compare how different creators approach it.

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• Panspermia is the hypothesis that life on Earth did not originate spontaneously (abiogenesis) but was instead brought here from outer space in the form of biological "seeds." This idea proposes that microorganisms, extreme-resistant spores, or complex organic precursors are capable of traveling through interplanetary or interstellar space aboard comets, meteorites, and cosmic dust. Upon landing in favorable conditions on a new planet, these cosmic hitchhikers can initiate biological evolution. Notably, panspermia does not solve the mystery of how life initially emerged in the universe; it merely shifts the starting point of genesis from early Earth to another cosmic location. Within the scientific community, the concept is generally divided into two main categories: natural (lithopanspermia) and directed (intentional). Lithopanspermia suggests that rock fragments blasted off the surface of a life-bearing planet (such as ancient Mars) by powerful asteroid impacts can drift through the vacuum of space and accidentally collide with other celestial bodies. This theory is supported by actual discoveries of Martian meteorites on Earth (like ALH 84001) and the proven extreme resilience of certain terrestrial organisms — such as tardigrades, Deinococcus radiodurans bacteria, and fungal spores — which can survive years of cosmic radiation, hard vacuum, and freezing temperatures, while also enduring the crushing pressures and heat of atmospheric entry. Conversely, directed panspermia—a concept famously co-proposed by DNA co-discoverer Francis Crick—explores the scenario where life was intentionally sent to a young Earth by an advanced alien civilization. In the 21st century, as amino acids and complex hydrocarbons are continuously found inside comet tails and meteorites (such as the Murchison meteorite), a variant known as pseudopanspermia (or molecular panspermia) has gained significant traction. This view argues that space delivers not living organisms, but ready-made organic building blocks, which dramatically accelerated chemical evolution in our planet's primordial oceans. #scary #facts #life #Science@ʜᴏʟᴠᴇᴋ
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