Year 2017 19,000,000,000,000,000,000,000 possible earth like planets in the universe ✨️ 💖 🙏 ❤️
How do scientists know that there are billions of other solar systems like us in the Universe? originally appeared on Quora: the place to gain and share knowledge, empowering people to learn from others and better understand the world.
Answer by Robert Frost, Instructor and Flight Controller at NASA, on Quora:
How do scientists know that there are billions of other solar systems like us in the Universe?
They don’t know that, and I’ve never come across one that made that claim.
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