Across
- 2. an astronomical body orbiting a star or stellar remnant.
- 5. the spatial period of a periodic wave.
- 6. use a convex lens to concentrate.
- 7. the close star to earth.
- 10. the entire range of radiant energy.
- 11. an optical instrument that aids in the observation of remote objects by collecting electromagnetic radiation.
- 12. a group of galaxy.
- 13. an instrument located in outer space to observe distant planets, galaxies and other astronomical objects.
- 15. the act of interfering, invading, or poaching.
Down
- 1. collect visible light waves.
- 3. use a curved mirror to concentrate.
- 4. all what in space.
- 8. type of astronomical object consisting of a luminous spheroid of plasma.
- 9. the alteration of the original shape of something.
- 14. quantitative property that must be transferred to an object.