Everyone was delighted to hear the news that the rocket entered orbit.
A rut in the road is for some reason an orbit or trajectory. Maybe imagine a big ol' rut in the road. You drive at it at very high speeds, hit it, and fly into the sky at a trajectory that will send you into orbit. Now you're up in space, circling the earth, wishing you didn't drive so fast.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.