9 — 9 Need-to-Knows About the Cosmos!

9 - 9 Need-to-Knows About the Cosmos! 1. The biggest known star is 1,708 times the size of our sun. 2. The universe is ~13.82 billion years old. 3. There are more stars in the universe than grains of sand on Earth. 4. There is no sound in space. 5. Our sun has a lifespan of about 10 billion years and we're halfway through it. 6. Light from the sun takes 8 minutes to reach Earth. 7. Our universe has been expanding since it formed. 8. Our universe consists of 73% dark energy. 9. There may be ~20 trillion galaxies in the universe.

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