1961 Earth is a ‘slightly irregular ellipsoid, according to photographic data received from vanguard 1 and 2.
1961 Earth is a ‘slightly irregular ellipsoid, according to photographic data received from vanguard 1 and 2.
根据接收到的“先锋1号”和“先锋2号”人造卫星发回的摄像资料，地球是一“稍不规则的椭圆球体”。