Across
- 3. I’m a path around something in space.
- 6. Magnitude (M) I’m a star’s real brightness at a standard distance.
- 7. I’m the smallest part of an element.
- 9. Fusion I’m how stars make energy by joining nuclei.
- 10. I’m a negative particle that moves around the atom’s center.
- 11. I’m a positive particle in an atom’s center.
- 14. I’m a push or pull on something.
- 15. Method I’m the step-by-step way scientists investigate.
Down
- 1. I pull objects together, even planets.
- 2. Year (ly) I’m how far light travels in a year.
- 4. (pc) I’m about 3.26 light years long.
- 5. (L) I’m the total energy a star gives off every second.
- 6. Magnitude (m) I’m how bright a star looks from Earth.
- 8. Unit (AU) I’m the average distance from Earth to the Sun.
- 12. Universe I’m all that can be seen in the universe.
- 13. I’m a neutral particle in an atom’s nucleus.