[填空题]
Halley’s comet orbits the Sun rod) ksp5+.smmdughly once every 76 years. It comes ve(nhif ibsu.q +) oqxx qz3pb8yo:*5 h:ry close to the surface of the Sun on its closest approach (Fig. 5–39). Estimate the greatest dis.iqnh)8x+q (*shob::p5qzxby 3uo if tance of the comet from the Sun. Is it still “in” the Solar System? What planet’s orbit is nearest when it is out there? [Hint: The mean distance s in Kepler’s third law is half the sum of the nearest and farthest distance from the Sun.] $\times 10^6$
