| Answer | Crossword Clue |
|---|---|
| SUN | Center of our universe. |
| antimatter | Molecules formed by atoms consisting of antiprotons, antineutrons, and positrons. Stable antimatter does not appear to exist in our universe |
| MILKYWAY | Our place in the universe |
| SUN | Center of the universe for a heliocentrist |
| COPERNICUS | He placed the sun at the center of the universe |
| SUN | Heliocentric universe center |
