Here is the correct matching of terms from Column A to their definitions in Column B:
- When a large star Explodes, it is called a k. Supernova
- A cloud of gas that is present both at the birth and death of a star: p. Nebula
- Dark matter, stars, dust and gas all make up a l. Galaxy
- The #1 force that holds a galaxy together: i. Gravity
- Waves of energy given off throughout space: r. Electromagnetic waves
- A vacuum at the center of a Galaxy: h. Black Hole
- Galaxies gather in a. Groups & Clusters to form the universe:
- Galaxy that is flat, with older stars and not much gas/dust: c. Elliptical Galaxy
- Most common Galaxy that is coiled, with newer stars on its "arms" and a moderate amount of gas/dust: f. Spiral Galaxy
- Galaxy that is smaller and younger, not well formed, and has a lot of gas/dust: g. Irregular Galaxy
- During the formation of a black hole, the core of a star collapses into one super dense point called a e. Singularity
- The area around a black hole where light and matter cannot exit is called the s. Event horizon
- 5% of the universe is this type of "ordinary matter" made up of atoms: m. Baryonic matter
- 25% of the universe is made up of this atypical matter that does not interact with radioactive energy but clearly has gravitational pull: j. Dark Matter
- 70% of the universe is made up of this dynamic (but mostly unexplained) energy: t. Dark energy
- Radiation that was left over since the beginning of the Universe: n. Cosmic Microwave background
- Model of Galaxy formation where a gas cloud collapses and then stars are made (all the same age stars): o. Outside-in model
- Model of Galaxy formation where smaller building blocks combined through gravitational forces to build a galaxy: q. Inside-out model
- A gradual change of a galaxy's size, shape and composition: b. Evolution
- The technology that allows us to study black holes: d. Radio Telescope
This should accurately reflect the definitions matched with the appropriate terms.