21 terms

Apologia Physical Science Module 16

The process by which two or more small nuclei fuse to make a bigger nucleus.
Nuclear Fusion
The process by which a large nucleus is split into smaller nuclei.
Nuclear Fission
The amount of isotope necessary to sustain a chain reaction.
Critical Mass
The brightness of a star, corrected for distance, on a scale of -8 to +19. The smaller the number the brighter the star.
Absolute Magnitude
The brightness of a star as seen in the night sky. The smaller the number, the brighter the star.
Apparent Magnitude
Energy equals mass times the speed of light squared.
What does e = mc² mean?
core, radiative zone, convection zone, photosphere
What are the four regions of the sun from the in out?
main sequence, white dwarfs, red giants, supergiants
What are the four types of stars on the H-R Diagram?
pulsating variables, novas
What are the two types of variable stars?
a nebula
When a supernova explodes it creates what?
parallax method, apparent magnitude method
What are the two main ways astronomers measure the distance from the earth to a star?
The distance light could travel along a straight line in one year.
Light Year
A large ensemble of stars, all interacting through the gravitational force and orbiting around a common center.
spiral, lenticular, elliptical
What are the three types of galaxies?
True or false? The universe is expanding.
red shift
a phenomenon in which light that comes to the earth from other galaxies ends up having longer wavelengths than it should
true or false- a nuclear power plant can explode
the sun's core
nuclear fusion occurs in
milky way
what galaxy does the earth belong to
Cepheid variables
stars whose magnitude and period have a direct relationship
spiral galaxy
what type of galaxy is the milky way