Across
- 3. A robotic space probe launched by NASA on September 5, 1977, designed to study the outer solar system, is this?
- 6. A massive, habitable artificial satellite and orbiting laboratory in low Earth orbit is this?
- 7. A fundamental property of matter that measures the amount of substance in an object is this?
- 8. The lightest and most abundant chemical element in the universe is this?
- 11. The planet we live on is this?
- 13. A giant, glowing cloud of gas and dust in interstellar space is this?
- 14. Another word for the North Star is this?
- 16. The natural tendency of objects to resist changes in their current state of motion is this?
- 17. A region in space with a gravitational pull so intense that nothing—not even light—can escape it is this?
- 18. What keeps us on Earth,and is also known as 9.8 is this?
- 21. A unit of distance, not time.It is defined as the total distance that a beam of light travels through a vacuum in one Earth year is this?
Down
- 1. How long it takes for the International Space Station to orbit is this?
- 2. Leo and Cancer the Crab are examples of this?
- 4. A doughnut-shaped region of icy debris and dwarf planets that orbits the Sun beyond Neptune is this?
- 5. The closest major spiral galaxy to our own Milky Way, located about 2.5 million light-years away is this?
- 8. A space-based observatory launched by NASA in 1990 is this?
- 9. Machines launched into space for communication, navigation, and research is this?
- 10. A hazy, luminous band of light stretching across the night sky is this?
- 12. The closest star system to our solar system is this?
- 15. A repeating path of one object in space takes around another object or a center of gravity or a center of gravity?
- 18. A massive, gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter is this?
- 19. Mercury is this
- 20. A burning ball of hydrogen and helium is this?