[填空题]
Halley’s comet orbits the Sun roughly,vhhhk-u .t (*ur 0 7 ssvjqbmdnoy;p/,t,;jq once every 76 years. It comes vermc(qpp /rjk wa)j(tb3 r9wr1g;e b7a:y close to the surface of the Sun on its 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 9m1cq)bj3g jrraw ;w pp/(k( 7 ra:tbefarthest distance from the Sun.] $\times 10^6$
