cool early Earth
hypothesis which posits that for part of the Hadean eon, at the beginning of Earth's history (after the extreme conditions of 4.5±0.1 Ga ago, but before the LHB of 3.95±0.15 Ga ago), it had a modest bolide count and was cool, allowing liquid water
en-GB/ˈkuːl ˈɜːlɪ ˈɜːθ/
en-US/ˈkul ˈɝli ˈɝθ/