Chapter 3 - The Solar System

3. Meteoroids that pass through the atmosphere and are found on Earth's surface.
4. The solid inner core of a comet.
5. Areas of gas on the sun's surface that are cooler than the gases around them.
7. From the Latin word "terra" meaning Earth.
11. The outer layer of the sun's atmosphere, appears as a white halo during an eclipse.
12. The central region of the sun.
13. An object that orbit the sun, has enough gravity to be spherical but has not cleared the area of its orbit.
14. A meteoroid as it's moving through Earth's atmosphere.
15. Four largest, outer planets made mostly of gas.
17. Huge loops of gas that often link different parts of sunspot regions.
21. A thin disk of small particles of ice and rock.
22. 'Ge' is the Greek word for 'Earth, an Earth-centered model of the solar system.
24. A region of tightly packed gas where energy moves mainly in the form of electromagnetic radiation.
26. Earth and the other planets revolve around the sun.
27. The extension of the corona into space that thins into streams of electrically charged particles.
28. Must be round, orbit the sun, and have cleared out the region of the solar system along its orbit.

1. An oval shape.
2. Beyond Neptune's orbit and extends about 100 times Earth's distance from the sun.
6. Beyond the Kuiper belt this region stretches out more than 1,000 times the distance between the sun and Neptune.
8. Sometimes loops in the sunspot regions suddenly connect, releasing large amounts of magnetic energy, causing gas to erupt into space.
9. The inner layer of the sun's atmosphere. Gives off visible light.
10. The middle layer of the sun's atmosphere.
12. Loose collection of ice, dust and and small rocky particles whose orbits can be very long, narrow ellipses.
16. Irregular rocky objects that are too small and numerous to be considered dwarf planets.
18. Hydrogen atoms join to form helium.
19. Clouds and dust form this fuzzy outer layer of a comet.
20. Chunks of rock or dust smaller than asteroids.
23. The outermost layer of the sun's interior.
25. A region of the solar system between Mars and Jupiter where most asteroids orbit.