[填空题]
Halley’s comet orbits tst 0c7b4znr7z he Sun s/at+g*q bn:h roughly once every 76 years. It comes very close to the surface of the Sun on its nas * qg+bht:/closest approach (Fig. 5–39). Estimate the greatest distance 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.] $\times 10^6$
