Across
- 2. the force by which a planet or other body draws objects toward its center.
- 4. includes all of space, and all the matter and energy that space contains
- 6. cosmic islands of stars, gas, dust, and dark matter held together by gravity.
- 7. where planets and stars
- 8. space was filled with an unstable form of freely throughout the Universe
- 9. expansion of space
Down
- 1. origin of the universe
- 3. the chemical element with the symbol H and atomic number 1 (hint: in h20)
- 5. official symbol is He, and its atomic number is 2 (hint: blowing up a balloon)
- 7. 4.5 billion-year-old yellow dwarf star – a hot glowing ball of hydrogen and helium
- 10. an idea of how things happen