Space
Earth may be partly made of rocks from elsewhere in the galaxy
We’ve only seen one interstellar object, a rock called ‘Oumuamua that passed by in 2017, but they may be crucial to speeding up the planet-building process
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We’ve only seen one interstellar object, a rock called ‘Oumuamua that passed by in 2017, but they may be crucial to speeding up the planet-building process
The Spitzer Space Telescope failed to spot ‘Oumuamua, the first interstellar object we’ve ever seen, but we were still able to learn something about this strange space rock