How to pronounce “space rock” in English

So what I want to do is take you back 66 million years ago to the last great mass extinction in Earth's history.We were hit by a space rock about six, seven miles across, moving at 150,000 miles an hour.It slammed into the Yucatan Peninsula, brought outer space right to the surface of the planet, blew a hole about 100 miles across and 20 miles deep,