STEM

123456789
Across
  1. 2. it has a bulge in the middle and arms that spiral outword
  2. 3. it happens from a cloud getting hotter and condensing
  3. 5. a huge group of single stars,and planets.
  4. 8. an instrument scientist use to spread light into different wavelenghts
  5. 9. only shapes,bright young stars.
Down
  1. 1. a active young galaxies with black holes at the center.
  2. 4. its round or flattened balls,and only old stars
  3. 6. they are born from contracting gas and dust from a nebula
  4. 7. the range of wave lengths that stars evnit