Science and Technology Crossword 8

Click on a number in the crossword, write your answer, and then click "Enter". (Click "Hint" if you need help to get the next letter in each word.)
1     2    3    4   
        
        
5          
        
6          
     7     
 8         

Across

1. Massive star
5. Cares for, as in offspring
6. An acid in urine
7. "Numbers" abbreviation
8. The planets _ _ _ _ _ the sun.

Down

1. Recent field of physics
2. A type of electricity
3. To change direction
4. Science of matter and energy