Match the words in the left-hand column to the appropriate blank in the sentences in the right-hand column. Use each word only once.

1. The ______ of the Hubble Space Telescope is better for shorter (bluer) wavelengths of light than for longer (redder) wavelengths of light.
2. The large research observatories on Mauna Kea use giant ______.
3. ______ separate the various colors of light, allowing astronomers to determine stellar composition and many other stellar properties.
4. The twin 10-m Keck telescopes can work together to obtain better angular resolution through a technique known as ______.
5. The Chandra X-ray observatory focuses X rays with ______ mirrors.
6. A 10-meter telescope has a larger ______ than a 4-meter telescope.
7. Galileo's telescope designs using lenses were examples of ______.

WORD BANK
- angular resolution
- grazing incidence
- interferometry
- spectrographs
- light-collecting area
- refracting telescopes
- reflecting telescopes