Outer Space

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Across
  1. 2. A cloud of dust and gas in space, the nursery of stars!
  2. 6. When the moon becomes gradually less visible.
  3. 7. A person trained to travel in a spacecraft.
  4. 10. A half of the Earth, when divided along the lines of either North and South or East and West.
  5. 12. A unit of measurement that’s roughly the distance from the Earth to the Sun (93 million miles).
  6. 13. The time when the Sun crosses the celestial equator and day and night are the same length. This happens twice a year.
  7. 15. Objects made of frozen gases, rock and dust that orbit the Sun.
  8. 17. How bright a star burns.
  9. 20. The area of air and gas that envelopes Earth and other astronomical objects.
  10. 21. A man-made object that orbits Earth, where astronauts can live and conduct experiments.
  11. 23. A scientist who studies the universe.
  12. 25. Small particles of matter in space.
  13. 29. A period of intense activity in a galaxy where lots of stars are formed.
  14. 31. Our galaxy that contains over 200 billion stars.
  15. 32. An instrument that allows us to see into space.
  16. 35. A celestial body that orbits the sun that has sufficient mass for its gravity to overcome rigid body forces and has not cleared the neighborhood around its orbit.
  17. 36. A small body of matter from outer space that enters Earth’s atmosphere and appears like a streak of light.
Down
  1. 1. The distance light travels in one year (nearly 6 trillion miles).
  2. 3. A place in space where the pull of gravity is so strong that even light can’t get out.
  3. 4. The main theory explaining how the universe started. It states that 13.8 billion years ago, space expanded quickly to form the atoms that would produce stars and galaxies.
  4. 5. A cold and dark area of our Solar System which contains thousands of comets, asteroids and other objects.
  5. 6. When the moon becomes gradually more visible.
  6. 8. The universe.
  7. 9. A group of stars that form a pattern.
  8. 11. The force that pulls objects towards each other.
  9. 14. Basic units of matter that every solid, liquid, gas and plasma is composed of.
  10. 15. A cavity in the ground of a celestial object, typically caused by explosions or meteor impact.
  11. 16. When one celestial body blocks light from reaching another by moving between it and its light source.
  12. 18. A large celestial object that acts as a natural satellite to Earth. Most planets in our solar system have at least one moon and some have several.
  13. 19. A regular and repeating circuit that one celestial object takes around another.
  14. 22. The star that objects in our solar system orbit.
  15. 24. How much material an object is made up of, as opposed to weight which measures the pull of gravity on an object.
  16. 26. The gaseous outer layer of the Sun’s atmosphere.
  17. 27. An astronomical object made of bright, glowing matter called plasma. They’re held together by gravity and are incredibly hot.
  18. 28. A huge collection of gas, dust and billions of stars and their solar systems held together by gravity.
  19. 30. Everything that exists in space.
  20. 33. Less than half the object is illuminated
  21. 34. The three-dimensional expanse in which all material things exist.
  22. 37. A building equipped with materials to make astronomical observations.