16. It’s also so wide that if you were standing on the edge of its caldera, the base of the volcano would be over the horizon.
17. The sun makes up 99% of the mass of the solar system.
18. The Milky Way galaxy has four spiral arms, not two as depicted in pop culture.
19. It takes a photon, on average, 170,000 years to travel from the core of the sun to the surface.
20. Then it takes just 8 minutes from the suns surface to your eyes.
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