释义 |
第四宇宙速度dì sì yǔzhòu sùdù宇宙速度的一级,预计物体具有110—120公里/秒的速度时,就可以脱离银河系而进入其他星系,这个速度叫做第四宇宙速度。{4th cosmic velocity; grade in cosmic velocity to be reached when travelling at a speed of 110-120 km per second, speed which makes it possible to leave the Milky Way and travel to other galaxies} |