Unexplainable podcast: 7 solar system mysteries scientists haven’t solved yet - Vox.com

Why is our moon so weird? Was there ever life on Mars? Big cosmic questions lurk in our celestial backyard.

The next time you look up at a bright full moon, think about this: No one knows, precisely, where the moon came from. We have no idea why the moon is here, science writer Rebecca Boyle says on Unex… [+9119 chars]

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