A planet's sidereal orbital period can be measured from repeated observations of its location inthe sky (so long as Earth's own motion around the Sun is properly taken into account).
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Q1: Earth is nearly twice as large as
Q2: The mass of all the planets combined
Q4: All the jovian planets lie beyond the
Q5: Of all the terrestrial planets, Mercury's orbit
Q6: One characteristic of the terrestrial planets is
Q7: All the terrestrial planets lie inside the
Q8: All jovian planets in our solar system
Q9: The solar system contains the Sun, eight
Q10: Comets are not actually members of the
Q11: Comets are easier to identify than asteroids
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