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If someone in a distant stars is watching for signals of life coming from other planets, how far did the signal of life in earth travel yet, in a cosmological context?
In terms of just life on our planet? About 4 billion years ago, give or take a few hundred million years. If you wait for a few billion years, the organisms begin to significantly alter the atmosphere of the Earth, creating a signal that could potentially be recognizable to alien entities. Perhaps 2 billion light years?If someone in a distant stars is watching for signals of life coming from other planets, how far did the signal of life in earth travel yet, in a cosmological context?