A famous astronomer has reported the discovery of a pair of planets orbiting another star, claiming that the orbit of the outer planet has (i) a semi-major axis that is 7 times larger than that of the inner planet, and (ii) a period is that is 7 times larger than that of the inner planet. What conclusion can you draw about this discovery?


a.The discovery might be correct, since the planets orbiting another star might be very different from those in our own solar system.

b.It is not possible to draw any conclusions about the famous astronomer's discovery.

c.The discovery is flawed, since it is impossible for any pair of planets to have the properties that the famous astronomer claims to have measured.

d,The discovery is likely to be correct, since a planet at a greater distance from its star is expected to have a longer orbital period.