Venus summary

Arecibo Observatory, astronomical observatory located 16 km (10 miles) south of the town of Arecibo in Puerto Rico. It was the site of the world’s largest single-unit radio telescope until FAST in China began observations in 2016. This instrument, built in the early 1960s, employed a 305-metre

Solar system, assemblage consisting of the Sun—an average star in the Milky Way Galaxy—and those bodies orbiting around it: 8 (formerly 9) planets with more than 400 known planetary satellites (moons); many asteroids, some with their own satellites; comets and other icy bodies; and vast reaches of

Sun, star around which Earth and the other components of the solar system revolve. It is the dominant body of the system, constituting more than 99 percent of its entire mass. The Sun is the source of an enormous amount of energy, a portion of which provides Earth with the light and heat necessary

Planet, (from Greek planētes, “wanderers”), broadly, any relatively large natural body that revolves in an orbit around the Sun or around some other star and that is not radiating energy from internal nuclear fusion reactions. In addition to the above description, some scientists impose additional