Astronomy crossword puzzle

Two dimensional graph used to determine a stars brightness and temperature
The brightness a star would have if it were at a standard distance from earth
The brightest star in orion
A group of stars that form a pattern
The force causing our universe to expand rapidly
A special type of galaxy with a ellipsoidal and smooth almost featureless image
A phase of the moon where it is completely illuminated
The force that pulls two objects towards each other and causes objects to fall
Planets that lie within the asteroid belt
A unit of measurement for the distance that light travels in one year
Different shapes or the moon caused by the sun shining on the moon
When there is little to no change in the tide
When there is drastic change in the tides
Active young galaxies with massive black holes in the center