In December 1999, a planet circling another star outside Earth's solar system was discovered by

Options :
  1. Edmond Halley and Carl Sagan
  2. Edwin Hubble and William Herschel
  3. Ptolemy and Tycho Brahe
  4. Marcy and Paul Butler
Answer and Explanation :-

Answer: Option 4


Actually it is a bloated gas giant ball as big as Jupiter but weight only 63% of Jupiter.

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