❥Define the "Host".... according to Astronomy....! ☻
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surbhi9774:
The biological definition of a host is an organism that harbors another organism inside or near their body in a symbiotic relationship. A symbiotic relationship refers to two organisms living together.
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Exoplanet host stars
The observational study of extrasolar planetary systems is a very recent topic. Instruments capable of detecting the radial-velocity variations of a solar-like star induced by orbiting Jupiter-like planets were built in the 1970s. These led to the detection of the first extrasolar planet in 1995, a hot Jupiter in a very close orbit around the star 51 Peg. During the following years, the radial velocity method was the most successful method for planet discovery, with steadily increasing detection numbers. Until 2002, 60 planets had been detected, and from 2002 to 2010, about 30 to 80 planets per year were detected.
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