It seems like you're looking to fill in the blanks about how matter from space or a star forms a nebula. Here are the possible completions:
- "collapse" (for matter from space)
- "explode" (for matter from a star)
So the completed statement would be:
"Matter from space can collapse to form a nebula or matter from a star can explode to form a nebula."
You can drag and drop "collapse" and "explode" into the correct response areas.