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- 3. Constellation An apparent group of stars originally named for mythical characters. The sky is divided into 88 constellations.
- 4. Binary star One of two stars revolving around a common center of mass under their mutual gravitational attraction.
- 7. Absolute Magnitude The apparent brightness of a star if it were viewed from a distance of 32.6 light-years.
- 11. Cepheid Variable A star whose brightness varies periodically because it expands and contrasts.
- 12. Nova A star that explosively increases in brightness.
- 16. Binary stars are used to determine the star property most difficult to calculate- its mass.
- 17. The nearest stars have the largest parallax angles, while those of distant stars are too small to measure.
- 18. Three factors control the apparent brightness of a star as seen from Earth: how big it is, how hot it is, and how far away it is.
- 19. A Hertzsprung Russell diagram shows the relationship between the absolute magnitude and temperature of stars.