Welcome back to the Abstract! These are the studies this week that searched for the ur-animals, wandered the poles, rained on Mars, and destroyed the solar system.First, scientists present new evidence that the first animals appeared more than 800 million years ago, a truly ancient origin that suggests our metazoan ancestors survived a period known as Snowball Earth, when our planet is thought to have been nearly completely frozen. Then: Earth’s poles won’t sit still, the sepulchral stuff of life, and a dramatically shortened lifespan for our solar neighborhood.As always, for more of my work, check out my book First Contact: The Story of Our Obsession with Aliens, or subscribe to my personal newsletter The BeX...
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