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Across 4. EXPLOSION THAT BREAKS A STAR APART 6. THE ACTUAL AMOUNT OF LIGHT A STAR GIVES OFF 9. GRAVITY SO GREAT THAT LIGHT CANNOT ESCAPE IT 14. PLIEDES 15. DISTANCE TO STARS FROM EARTH 17. WHEN HYDROGEN BECOMES HELIUM 18. MILKY WAY GALAXY 19. HOW BRIGHT WE SEE IT 20. BRIGHTNESS VARIES

Down 1. NEUTRON STARS THAT GIVE OFF RADIO WAVES 2. 10 TO 100 TIMES LARGER THAN THE SUN 3. THE SMALLEST STARS 5. STAR PATTERNS 7. SHAPED NEARLY SPHERICAL OF ROUND 8. ONE SHADOWS THE OTHER 10. PAIRS OF STARS 11. SPHERICAL OR ROUND IN SHAPE 12. ONE-HALF THE DIAMETER OF THE EARTH 13. THE EXPLOTION FROM A STAR 16. A NEW STAR