Across
- 2. the solid inner core of a comet
- 7. a donut-shaped region that stretches from around Pluto’s orbit to about 100 times Earth’s distance from the sun
- 8. further developed the geocentric theory - he also said that the planets move on small circles that move on bigger circles
- 9. called the father of systematic astronomy, and used math to determine longitude and latitudes of the Earth
- 12. the name given to the first four outer planets (Jovian planets)
- 15. the region of the solar system between the orbits of Mars and Jupiter, where many asteroids are found
- 16. astronomer that studied under Plato
- 17. the fuzzy outer layer of a comet
- 19. the middle layer of the sun’s atmosphere
- 20. first to measure the distance around the Earth
- 23. wrote the three laws about the movement of planets (and studied under Brahe)
- 24. a thin disk of small ice and rock particles surrounding a planet
- 26. the outer layer of the sun’s atmosphere
- 27. a meteoroid that passes through the atmosphere and hits Earth’s surface
- 31. the study of the moon, stars, and other objects in space
- 32. a loose collection of ice, dust, and small rocky particles, typically with a long, narrow orbit
- 33. the inner layer of the sun’s atmosphere that gives off its visible light
- 35. the model of the universe where the Earth is at the center
- 36. a dark area of gas on the sun’s surface that is cooler than surrounding gases
Down
- 1. the process by which hydrogen atoms join together in the sun’s core to form helium
- 3. the first astronomer to say that the sun is the center of the universe in 1514
- 4. a region of very tightly packed gas in the sun’s interior where energy is transferred mainly in the form of light
- 5. the name given to the first four, inner planets
- 6. discovered the planet that would eventually be called Uranus
- 10. a stream of electrically charged particles that emanate from the sun’s corona
- 11. he used his telescope to prove the heliocentric theory, and discovered the phases of Venus
- 13. a huge, reddish loop of gas that protrudes from the sun’s surface, linking parts of sunspot regions
- 14. first astronomer to discover a super nova in 1572
- 17. the central region of the sun, where nuclear fusion takes place
- 18. a chunk of rock or dust in space
- 21. an eruption of gas from the sun’s surface that occurs when the loops in sunspot regions suddenly connect
- 22. the trapping of heat by a planet’s atmosphere
- 25. the model of the solar system in which the Earth and other planets revolve around the sun
- 26. the outermost layer of the sun’s interior
- 28. an oval shape, which may be elongated or nearly circular; the shape of the planets’ orbits
- 29. a spherical region of comets that surrounds the solar system
- 30. a streak of light in the sky produced by the burning of a meteoroid in Earth’s atmosphere
- 34. rocky objects revolving around the sun that are too small and numerous to be considered planets