Across
- 1. magnitude one of the most basic observable properties of a star is how bright appears
- 6. group of stars
- 7. sequence most stars occupy the region in the diagram
- 8. astronomers use two units of measure for long distances
- 9. star when only two stars are gravitationally bound together and orbit aa common center of mass
Down
- 2. apparent shift in position caused by the motion of the observe
- 3. to measure the energy output from the surface of a star per second
- 4. russell diagram absolute magnitude is plotted on the vertical axis
- 5. magnitude how bright a star would appear if it were placed at a distance of 10 pc