Astronomy - 2

Complete the crossword, then click "Check Answers". If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to begin the crossword. Note that two-word answers exist too.
1       2      3        
               
4                 
              5   
       6          
               
7             8      
       9          
               
               
               
               
               
 10