How did the Arecibo Observatory contribute to studies of pulsars and planetary radar?

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Radio telescope Lovell Telescope, a fully steerable radio telescope at Jodrell Bank, Macclesfield, Cheshire, England.

The Arecibo Observatory was a pivotal facility for advancing our understanding of the universe through its unique radio telescope capabilities.

Contributions to Pulsar Research

Arecibo was instrumental in groundbreaking pulsar discoveries:
* Binary Pulsars: Astronomers Russell Hulse and Joseph H. Taylor, Jr. used the telescope to discover the first binary pulsar. Their observations confirmed that the system lost energy via gravitational radiation at the precise rate predicted by Albert Einstein’s theory of general relativity, earning them the 1993 Nobel Prize in Physics.1
* Extrasolar Planets: In 1992, scientists utilized the observatory to discover the first extrasolar planets orbiting the pulsar B1257+12.1

Planetary Radar Studies

The observatory’s high-power radar capabilities allowed for detailed mapping and analysis of solar system bodies:
* Surface Mapping: Arecibo produced highly detailed radar maps of the surfaces of Venus and Mercury.1
* Rotational Discovery: Radar observations revealed that Mercury rotates every 59 days, rather than the previously assumed 88 days, proving that it does not keep the same face toward the Sun.1