出典:Wikipedia
出典:『Wikipedia』 (2011/02/04 08:12 UTC 版)
Luna 4 (E-6 series) was the USSR's first successful spacecraft of their "second generation" Luna program. The spacecraft, rather than being sent on a straight trajectory toward the Moon, was placed first in a low Earth orbit (167 to 182 km altitude) and then the rocket stage reignited to send it on a curving path towards the Moon.