1: 1. The universe is home to over 100 billion galaxies. 2. Space is completely silent, with no sound waves. 3. Astronauts wear diapers during spacewalks for convenience.

2: 4. Neutron stars are so dense that a sugar-cube-sized amount would weigh more than all of Earth's human population combined. 5. The Sun is 400 times larger than the Moon but also 400 times farther away from Earth.

3: 6. Black holes are regions in space where gravity is so strong that nothing, not even light, can escape. 7. The first woman in space was Valentina Tereshkova in 1963.

4: 8. Mars has the largest volcano in our solar system, called Olympus Mons. 9. Jupiter's Great Red Spot is a massive storm that has been raging for centuries.

5: 10. The Milky Way galaxy is estimated to contain over 100 billion planets. 11. Earth's atmosphere is 78% nitrogen, 21% oxygen, and 1% other gases.

6: 12. The Hubble Space Telescope takes about 97 minutes to complete one orbit around the Earth. 13. The first image of a black hole was captured in 2019.

7: 14. The universe is thought to be around 13.8 billion years old. 15. The International Space Station orbits the Earth about every 90 minutes.

8: 16. Saturn's rings are made up of chunks of ice and rock. 17. The most distant man-made object from Earth is the Voyager 1 spacecraft.

9: 18. The speed of light is about 186,282 miles per second. 19. The Moon is gradually drifting away from Earth at a rate of 1.48 inches per year.

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