The value of radio and infrared astronomy is partly based on the fact that light at these wavelengths can travel through cosmic clouds of gas and dust without being absorbed. That means astronomers can observe phenomena in our Galaxy and in other galaxies that otherwise would be hidden from view at optical and shorter wavelengths. Radio emission at centimeter-to-meter wavelengths can be effectively observed from the ground. What are other unique characteristics of radio astronomy within this wavelength range?
Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer.

1. At these wavelengths, it is necessary to build telescopes with very large light-collecting ______ to obtain maps of sufficient sensitivity to faint cosmic signals.
2. At these wavelengths, it is necessary to build telescopes with very large signal-sensing ______ to obtain maps of sufficient detail.
3. Radio astronomers have pioneered the use of multiple telescopes working in concert that can produce maps of radio emission as detailed as optical images. These arrays of multiple telescopes are known as ______.
4. Astronomical observations at these wavelengths can be obtained even during ______.

WORD BANK
- interferometers
- storms
- areas
- baselines