Science Vocabulary-Test #3

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Across
  1. 6. Any object that orbits something else
  2. 11. An instrument for viewing distant objects (as objects in outer space) by focusing light rays with mirrors or lenses
  3. 12. How heavy something is.
  4. 16. A force that pulls (attracts) things towards the center of the earth. Or towards any physical body having mass.
  5. 19. A hypothetical whirling gaseous mass within a giant cloud of gas and dust that rotates around a sun and is believed to give rise to a planet.
  6. 20. An instrument for forming and examining spectra especially in the visible region of the electromagnetic spectrum.
  7. 22. The universe is all of space, and the matter and energy that space has.
  8. 24. The distance light can travel in a year.
  9. 25. Happens when two nuclei join to form a single nucleus.
Down
  1. 1. An enormous cloud of dust and gas occupying the space between stars and acting as a nursery for new stars.
  2. 2. What stars (like the Sun) become after they have exhausted their nuclear fuel.
  3. 3. The colossal explosion of a star.
  4. 4. A regular, repeating path that one object in space takes around another one
  5. 5. How astronomers explain the way the universe began.
  6. 6. The 'springing forth' of the tide during new and full moon.
  7. 7. The changes in frequency of any kind of sound or light wave produced by a moving source with respect to an observer.
  8. 8. A scatter plot of stars showing the relationship between the stars' absolute magnitudes or luminosities versus their stellar classifications or effective temperatures.
  9. 9. A broad band of light that made by a very large number of faint stars.
  10. 10. A period of moderate tides when the sun and moon are at right angles to each other.
  11. 13. A part of space that has a gravitational field so strong that nothing can escape from.
  12. 14. A system of billions of stars, held together by gravitational attraction. They are with (together) gas and dust.
  13. 15. A very long-period waves that move through the ocean in response to the forces exerted by the moon and sun.
  14. 17. The amount of matter.
  15. 18. A series of colored lines that correspond to wavelengths emitted by the glowing gas.
  16. 21. An unmanned device sent to explore space and gather scientific information
  17. 23. It's an exploding ball of burning gas held together by gravity