Dark Matter and Dark Energy

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Across
  1. 3. Matter that is made up of exotic particles
  2. 4. Astronomers rely on _____ radiation to observe the galaxy.
  3. 6. Like normal matter, dark matter has _____.
  4. 10. Matter between a light source and an observer can bend and distort that light. This effect is called gravitational _____.
Down
  1. 1. As much as seventy percent of the universe is thought to be _____.
  2. 2. Matter that is made up of protons and neutrons
  3. 5. Dark energy accounts for the ____ of the universe's expansion.
  4. 7. Many scientists believe that dark matter can pass _____ normal matter.
  5. 8. Normal matter makes up less than ____ percent of the universe.
  6. 9. Dark matter accounts for the extra ____ needed to keep the outer edges of spiral galaxies spinning at the same rate as their interiors.