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