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Skip to content You said: what was the theory that life on earth could have came from an asteroid, and life on it was from when the universe was 0 to 100°C ChatGPT said: The theory you're referring to sounds like a mix of panspermia and early-universe habitability ideas. Here's a breakdown: 🪐 Panspermia Theory Panspermia is the hypothesis that life did not originate on Earth, but was instead brought here by asteroids, comets, or meteoroids. The idea is that microbial life (or the building blocks of life) could survive harsh space conditions and be transferred between planets or even star systems. There are a few versions: Lithopanspermia: Life travels on rocks ejected by impacts. Radiopanspermia: Microbes travel on cosmic dust via radiation pressure. Directed panspermia: A controversial idea that life was deliberately seeded by intelligent beings. 🌌 Life in the Early Universe (0–100°C) This part refers to a speculative theory that the early universe — shortly after the Big Bang — may have had temperatures suitable for liquid water, which is essential for life as we know it. This is sometimes called the "habitable epoch of the early universe", proposed by physicist Abraham Loeb in 2014. Around 10 to 17 million years after the Big Bang, the cosmic background temperature cooled to the point where it was between 0°C and 100°C, the range in which water is liquid. In theory, rocky planets could have formed around early stars (Population III stars or even later ones). If those planets formed quickly enough, life could have originated during this brief cosmic window. Life (or its building blocks) from this early period could have been transferred across the universe via panspermia. 🧬 Combined Idea: So you're probably thinking of a combined hypothesis: Life originated very early in the universe — when temperatures allowed liquid water — and was later carried to Earth via asteroids or comets (panspermia). This is highly speculative but an intriguing idea that blends: Cosmology (early universe conditions) Astrobiology (life's origins) Planetary science (impact events, meteoritic transfer) Would you like a diagram or timeline to show how this theory works? You said: the ancestor of all complex cells & multicellular organisms was made by a cell eating another cell but not killing it, instead they merged into the 1st ever complex cell on earth. what is the name of this theory ChatGPT said: The theory you're referring to is called the Endosymbiotic Theory (or Endosymbiosis Theory). 🔬 Endosymbiotic Theory – Overview: This theory explains how complex cells (eukaryotes) — like those in plants, animals, fungi, and humans — evolved from simpler cells (prokaryotes). 🧫 Key Idea: A primitive prokaryotic cell (like a bacterium) engulfed another cell, probably a smaller prokaryote, but didn’t digest it. Instead of dying, the engulfed cell started living inside the host in a symbiotic relationship, eventually evolving into an organelle. 🧪 Main Examples of Endosymbiosis: Mitochondria Likely originated from an aerobic (oxygen-using) bacterium. Became the powerhouse of the cell, producing ATP. Chloroplasts (in plants and algae) Likely came from a photosynthetic cyanobacterium. Became the organelle that carries out photosynthesis. 🔍 Evidence Supporting the Theory: Mitochondria and chloroplasts have their own DNA, separate from the cell’s nucleus. Their DNA is circular, like bacterial DNA. They reproduce by binary fission, just like bacteria. They have double membranes, consistent with being engulfed. Their ribosomes resemble bacterial ribosomes, not those of eukaryotes. 🧬 Big Picture: This was a key step in the evolution of complex life on Earth. Without this event, multicellular life (like humans) would likely never have evolved. Would you like a simple visual showing how endosymbiosis happened? Attach Search Study No file chosenNo file chosen ChatGPT can make mistakes. Check important info. See Cookie Preferences.