[填空题]
Halley’s comet orbits th07vbm k5 xjvz/e Sun roughly once every 76 years. It w*;,c u(khgaie- bd2d3 2bb bfcomes very close to the surface of the Sun on its closest approach (Fig. 5–39). Estimate th3c-ibehbfk( gbb 2;d daw2u ,*e 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.] $\times 10^6$
