In 1859, some astronomers in Europe mistakenly thought that they had discovered a new planet orbiting very close to the Sun with a semi-major axis of 0.143 astronomical units. What would have been the period of this planets orbit if it had really existed?

0 votes
     about 0.9 years
      about 145 days
      about 20 days
      about 1.3 years
      about 6 hours
asked Sep 20, 2012 in Astronomy by anonymous

1 Answer

0 votes
about 20 days
answered Sep 22, 2012 by SkyStar ~Expert~ (2,855 points)

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