Extreme Space Word Puzzle

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Across
  1. 4. An object in space with such a strong gravitational pull that nothing, not even light, can escape from it.
  2. 5. An active galaxy with a supermassive black hole at its center.
  3. 7. Diagram A Diagram showing a star´s temperature and brightness in relationship to other stars.
  4. 8. The smallest particle of a chemical element that can exist on it´s own.
  5. 10. A rod- or dislike structure on spacecraft and telescopes used to transmit and receive radio signals.
  6. 11. A glowing cloud of gas around a star at the end of its life.
  7. 14. A field of force created by a planet, star, or galaxy, that surrounds it and extends into space.
  8. 15. Suitable for living in or on.
  9. 17. A Russian Astronaut.
  10. 18. The solid, hard outer layer of a planet or moon.
  11. 19. The amount of matter that occupies a certain volume.
Down
  1. 1. The layer of gas that surrounds a planet. Also the outermost layer of gas around the sun or a star.
  2. 2. A thick layer of hot rock between the core and the crust of a planet or moon.
  3. 3. A gaseous layer above the surface of a star, such as the Sun. Along with the Corona, it forms the star´s outer atmosphere.
  4. 5. The explosion that created the universe billions of years ago. According to the Big Bang theory, the universe began in an extremely dense and hot state and has been expanding ever since. The Big Bang was the origin of space, time, and matter
  5. 6. The thin, solid outer layer of a planet or moon.
  6. 9. A bowl-shaped depression on the surface of a planet, moon, asteroid, or other body.
  7. 12. The distance traveled by light in a vacuum in one year.
  8. 13. The imaginary line that passes through the center of a planet or star and around which the planet or star rotates.
  9. 16. A small, irregular solar system object, made of rock and/or metal, that orbits the sun.