Download Chapter 7 Vocabulary212

1. Spectroscope- used to study star’s characteristics by spreading light
into different wavelengths
2. Nuclear fusion- nuclei of several atoms combine to form on large
nucleus
3. astronomical unit- average distance between Earth and Sun (150
million km)
4. light year- distance light travels in 1 year
5. apparent magnitude- measure of how bright the object appears from
Earth
6. luminosity7. Star- large ball of gas held together by gravity
8. Radiative zone- shell of cooler, dense hydrogen above a star’s core
9. convection zone- where hot gas rises toward the surface and cooler
gas sinks in to the interior
10.photosphere- apparent surface of a star
11.chromosphere- orange-red layer above the photosphere
12.corona- wide outermost layer of a star’s atmosphere
13.Hertzsprung Russell diagram- is a graph that plots luminosity v
temperature of stars