[填空题]
Halley’s comet orbits the Sun rou9 i:rz fe3-j 7rc-fkvxghly once every 76 years. Il7mskt m+/y *t86ciqxt comes very close to the surface of the Sun on its closest approach (Fig. 5–39). Estimate6 sti7 qmctmxy +lk/*8 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.] $\times 10^6$
