Across
- 3. Type of interstellar cloud that obscures the light from background stars
- 6. This is a powerful and luminous stellar explosion
- 8. This is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.
- 9. Has atomic number 1
- 11. Gravitationally bound system of the Sun
Down
- 1. Has atomic number 2
- 2. This is all of space
- 4. A reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles
- 5. This is everything around you
- 7. Mass per unit volume
- 8. This is a natural phenomenon by which all things with mass brought toward one another.
- 10. Smallest unit of ordinary matter