[填空题]
Halley’s comet orbits the Sun roughly once every 76 years. u.qv5od4*uj amvi tyor0p*mf 5a 2/+rIt comes very 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’0 *rmtv/raf+p 5y2omis third law is half the sum of the nearest and farthest distance from the Sun.] $\times 10^6$
