Unit 7 Test Measuring the Stars

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Across
  1. 4. _____ shift in a star's spectra tells whether a star moves away or towards the Earth and how fast.
  2. 5. A star gravitationally bound to another star can either be part of a star cluster or a _____ star.
  3. 6. The _____ of a star determines its temperature, luminosity, and diameter
  4. 8. Also referred to as the HR Diagram for simplicity.
  5. 10. Alpha Centauri is a _____ star system
  6. 11. motion describes a star's movement relative to Earth over time (minus parallax).
  7. 12. A _____ is a longer unit of distance than a light-year.
  8. 14. These stars only live for a few million years.
Down
  1. 1. 90% of all stars lie on the _____ region of the HR diagram.
  2. 2. Using the law of _____ and orbital periods, astronomers can determine stellar masses of binary stars.
  3. 3. _____ brightness is how bright the star actually appears in the sky from Earth.
  4. 7. The apparent shift in a star's position caused by the observer's motion is called.
  5. 9. These stars are very dim and may live for trillions of years.
  6. 11. Typical lifespan for a _____ - like a star is about 10 billion years.
  7. 13. _____ binaries can be distinguished from each other by a telescope.