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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

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