crater – n. a large round hole in the ground made by the explosion of a bomb or by something falling from the sky

lag – v. to be in a position that is behind others

lunar – adj. of or relating to the moon

nebula – n. a cloud of gas or dust in space that can sometimes be seen at night; a group of stars that are very far away and look like a bright cloud at night

origin – n. the point or place where something begins or is created; the source or cause of something

asteroid – n. any one of thousands of small planets that circle around the sun

regional – adj. relating to a part of a country, of the world, etc. that is different or separate from other parts in some way