Imprints made 2.7 billion years ago hold clues to why the Earth was warmer than it should have been under a weaker sun. Fossilized imprints of raindrops that were sealed into stone 2.7 billion years ago indicate that Earth's early atmosphere could have been packed with greenhouse gases, according to new research that addresses a long-standing paradox of the planet's early history.
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- Setting the stage for life: Scientists make key discovery about the atmosphere of early EarthWed, 30 Nov 2011, 15:34:17 EST
- Early Earth absorbed more sunlight -- no extreme greenhouse needed to keep water wetTue, 6 Apr 2010, 15:12:35 EDT