ASTRONOMY CROSSWARD

2. is a pair of stars that appear to be close to each other in the sky when viewed from earth.
4. is a measure of luminosity,or how much light a star is actually radiating into space.
7. is a visible star plus an unseen companion star.
12. when electron falls back down, the atom radiates that energy in the form of a pallet of light called?
15. cannot be resolved in a telescope.

1. can be resolved with a telescope so that two separate stars can be seen.
3. mass per unit volume of the sun.
4. is the smallest particle of chemical element.
5. or the amount of angular change in a stars position per year.
6. gives positive identification of the chemical element that produced it.
8. speed towards or away from us along the line of sight.
9. the difficult problem of ascertaining the actual position and motion of stars.
10. is the analysis of spectra.
11. the atom which is left with an electric charge (positive) is called?
12. is used in measuring the distances to nearby stars.
13. the actual amount of light a star shines into space each second.
14. is the distance to an imaginary star whose parallax is 1 second of arc.