According to kepler's third law, a solar-system planet that has an orbital period of 8 years would have an orbital radius of about year(s)

Orbital period, T = 1.42 years

Explanation:

It is given that,

Orbital period of a solar system planet,

The orbital period of the planet can be calculated using third law of Kepler's. It is as follows :

M is the mass of the sun

r = 1.42 AU

So, the solar-system planet that has an orbital period of 8 years would have an orbital radius of about 1.42 AU.

the answer is b, have negligible mass

inverse v=i*r

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