Making an Outer Space Adventure by Means of the Periodic Return of Halley Comet
The spacecraft-Pioneer 10 is the first man-made object which flew out of the solar system, you never get it back; the outer space adventure makes Human observe nine planets at close hand by means of the periodic return of Halley Comet, you may get it back. The outer space adventure by the Halley Comet which is safe, economic and environmental protection can explore extraterrestrial civilization.
Y. F. Zhu, "Making an Outer Space Adventure by Means of the Periodic Return of Halley Comet", Applied Mechanics and Materials, Vol. 232, pp. 327-330, 2012