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Stellar Astronomy & Beyond Unit 1
Key Terms and Matching Definitions
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10 billion years
11 years
15 million degrees K
5 billion years
5800 K
8 minutes and 20 seconds
accretion disk
chromosphere
core
corona
coronal mass ejection
E = mc2
gamma rays
granule
helium
hydrogen
hydrogen fusion
Maunder minimum
neutrino
photosphere
proton-proton chain
radiative zone and convective zone
solar wind
sun spots
temperature and pressure
visible light
1. A disk of orbiting gas orbiting a newly-formed star.
2. The middle layer of the Sun’s atmosphere between the
photosphere and the corona.
3. The outermost layer of the Sun’s atmosphere which has
a temperature in the millions of degrees.
4. An event in which billions of tons of gas from the Sun’s
corona is suddenly blasted into space at high speed.
5. Most abundant element in our Sun.
6. A convection cell (where hot gas rises and cool gas
sinks) in the Sun’s photosphere.
7. A period of about 70 years starting around 1645 during
which very few sunspots were seen.
8. A subatomic particle with no electric charge that is
produced in the core of the Sun and trillions pass through
us undetected each second.
9. 2nd most abundant element in our Sun.
10. Temperature of the surface of the Sun.
11. Process that produces energy in the Sun.
12. Time it takes light from the Sun to reach Earth.
13. Equation that explains why nuclear fusion produces
energy.
14. Total lifetime of the Sun as a star.
15. Magnetic storms on the Sun’s surface.
16. Length of the sun spot cycle from one solar maximum
to the next.
17. Remaining number of years in the Sun’s life as a star.
18. The principle hydrogen fusion reaction occurring within the Sun.
19. Location in the Sun where hydrogen fusion is taking place.
20. Light is produced in this form during the hydrogen fusion reaction.
21. Hydrogen fusion can occur in the core because these two things are high enough.
22. Temperature in the center of the Sun.
23. The two outer layers of the Sun’s interior.
24. The Earth receives most of the Sun’s light in this region of the electromagnetic spectrum.
25. The continual outflow of particles from the Sun.
26. The surface of the Sun.