Use at least 15 of the following words. Extra words will be worth half a point each of extra credit.
Please write your ACROSS and DOWN clues on the back of your puzzle grid. These words all come from chapter 18 and are in the order of their appearance in the chapter.
- parsec
- photosphere
- proton-proton chain
- apparent magnitude
- absolute magnitude
- HR diagram
- main sequence
- red giant
- white dwarf
- nebula
- nucleosynthesis
- planetary nebula
- brown dwarf
- nova
- supernova
- neutron star
- black hole
- galaxy
- globular cluster
- Local Group
- dark matter
- Hubble's law
- dark energy
- Big Bang
- cosmic microwave background (you can use only a part of this and put some of it in your clue)
