Radiotelescope at Arecibo, Puerto Rico.
Since radio waves can pass through the Earth's atmosphere, radiotelescopes at ground-level, such as the one at Arecibo can detect distant "natural radio energy emitted by galaxies, erupting stars, clouds of gas, pulsars and quasars." In addition, the telescope can actively send and receive radar signals to observe objects in the solar system, and to measure aspects of the Earth's ionosphere.
Source: Image courtesy of the NAIC - Arecibo Observatory, a facility of the NSF. Photograher - unnamed.
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