Hally's comet last seen in 1986,next will be in ?
Correct answer: B. 2061
- A. 2031
- B. 2061
- C. 3051
- D. None of These
Explanation
Halley’s Comet returns roughly every 75 to 76 years, so its 1986 appearance is followed by an expected return in 2061. It is named after Edmond Halley, who calculated its periodic orbit.
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Inventions and Discoveries covers the people, dates, principles and practical uses behind developments such as the wheel, printing press, telephone, electricity, radio, computer, internet, vaccines and space technology. It distinguishes an invention, which creates a device or process, from a discovery, which identifies something already present in nature.
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