Across
- 4. Also known as star nurseries are giant clouds of dust and gas in space. Some nebulae are formed from supernovas.
- 5. A prefix meaning "relating to the sun"
- 7. The process in which gravity causes objects to contract, thereby converting gravitational potential energy into thermal energy.
- 9. A prefix meaning earth or ground.
- 10. The building blocks of planets formed from dust, rock, and other materials. Eventually, build up to larger masses called protoplanets.
- 11. Ptolemy A roman mathematician, astronomer, astrologer, geographer, and music theorist, who proposed the Ptolemic system or geocentric model which assumed that the earth was stationary and located at the center of the universe.
- 12. A mathematician and astronomer who developed the Heliocentric model of the universe that placed the sun rather than Earth at its center.
- 13. A gas cloud around a forming star that has been flattened by rotation. Once the star forms, the remaining material will be referred to as a protoplanetary disk while the planets begin to form.
Down
- 1. According to the nebula theory, a supernova triggered the collapse of a nebula, which began the formation of clumps of gas and dust. These clumps most likely became the sun and planets.
- 2. A German astronomer, mathematician, astrologer, natural philosopher and writer on music studied the motion of the solar system and developed the Laws of planetary motion.
- 3. Is a prefix meaning first, the earliest form of, primitive, or original.
- 6. A natural philosopher, astronomer, and mathmatition who made fundamental contributions to the sciences of motion, astronomy, and revolutionary telescopic discoveries.
- 8. The coming together and collection of matter under the influence of gravity and collisions to form larger bodies.