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Yes, it’s a hypothesis if you want to be strict about it. I don’t feel like arguing with a pedant today so here’s a short paper for you to read about a proposed habitable cosmological epoch: https://arxiv.org/pdf/1312.0613
Abraham “Avi” Loeb
In 2018, he suggested that alien space craft may be in the Solar System, using ʻOumuamua as an example. In 2023, he claimed to have recovered material from an interstellar meteor that could be evidence of an alien starship, which some experts criticized as hasty and sensational, and other experts showed that Loeb mistook ordinary truck traffic for a seismic evidence of the meteor, causing him to look hundreds of miles in the wrong direction.
