Discovering the UNIVERSE Crossword

SUPERMASSIVE BLACK HOLES IN THE CORES OF SOME GALAXIES THAT EMIT PARTICLES AND RADIATION
THE ANUAL PATH OF THE SUN ON THE CELESTIAL SPHERE; THE PLANE OF EARTH'S ORBIT AROUND THE SUN
THE CENTRAL PORTION OF ANY ASTRONOMICAL OBJECT
THE DISTANCE BETWEEN TWO SUCCESSIVE PEAKS IN A WAVE
THE TENDENCY OF ALL MATTER AND ENERGY TO ATTRACT ALL OTHER MATTER
THE SEQUENCE OF STELLAR SPECTRAL CLASSIFICATIONS FROM HOTTEST TO COOLEST STARS
HYPOTHETICAL PERFECT RADIATOR THAT ABSORBS AND REEMITS ALL RADIATION FALLING UPON IT
THE POINT IN ITS ORBIT WHERE A PLANET OR SOLAR SYSTEM BODY IS FARTHEST FROM THE SUN
TYPE OF PULSATING STAR WITH A PERIOD LESS THAN 1 DAY
A STARLIKE OBJECT WITH A VERY LARGE REDSHIFT
THE GRADUAL ACCUMULATION OF MATTER BY AN ASTRONOMICAL BODY, USUALLY CAUSED BY GRAVITY
THE POINT IN A CELESTIAL SPHERE DIRECTLY OVERHEAD
A VERY COMPACT,DENSE STELLAR REMNANT COMPOSED ALMOST ENTIRELY OF NEUTRONS
THE OUTERMOST LAYER OF THE SUN'S ATMOSPHERE
THE CENTRAL, COMPLETELY DARK PORTION OF A SHADOW