比如像j1407b这样巨大的系外星环系统，据科学家推测，j1407b可能是一颗非常年轻的天体，它的星环可能是由于原行星盘没有完全凝聚成卫星而形成的 ...

The rings around J1407b are so large that if they were put around Saturn, we could see the rings at dusk with our own eyes and camera phones. Here the rings as they would be seen in the skies of ...