Some truths about the Universe and our experience in it seem immutable. The sky is up. Gravity sucks. Nothing can travel faster than light. Multicellular life needs oxygen to live. Except we might need to rethink that last one.
In 2020, scientists discovered a jellyfish-like parasite that doesn't have a mitochondrial genome – the first multicellular organism ever found with such an absence. That means it doesn't breathe; in fact, it lives its life completely free of oxygen dependency.
This discovery doesn't just change our understanding of how life can work here on Earth – it could also have implications for the search for extraterrestrial life.
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