Astronomy Crosswords

3. The "fight" between Gravity and Dark Energy
5. theoretical scenario where gravity eventually wins the tug-of-war, causing the universe to stop expanding and collapse back in on itself.
6. Another term for the universe, often used when emphasizing it as a complex and orderly system.
9. A property of space itself that acts as a sort of "anti-gravity."
10. Massive systems of stars, gas, dust, and dark matter held together by gravity.
11. Anything that has mass and takes up space. In astronomy, this includes everything from dust grains to giant stars.

1. The observation that space itself is stretching, causing galaxies to move away from one another over time.
2. totality of all space, time, matter, and energy.
4. The universal force of attraction between all matter. It acts as the "glue" that holds galaxies together.
7. An unchanging state.
8. A mysterious form of matter that does not emit, absorb, or reflect light, making it invisible.