Ch. 22 Stars And Galaxies

Front 1

electromagnetic spectrum:

longest wavelength to shortest

Back 1

radio waves, microwaves, infrared waves, visible light, ultraviolet rays, x-rays, gamma rays

Front 2

colors of visible light:

longest wavelength to shortest

Back 2

red, orange, yellow, green, blue, violet

Front 3

reflecting telescope

Back 3

uses one or more mirrors to gather and focus light

Front 4

light-year

Back 4

a unit used to measure distances in space; the distance light travels in one year

Front 5

apparent magnitude

Back 5

the brightness of a star as seen from Earth

Front 6

white dwarf

Back 6

a star that has no fuel, but glows faintly

Front 7

less; more

Back 7

Stars with _________ mass will last longer than stars with __________ mass.

Front 8

more; less

Back 8

Stars with _______ mass will have shorter lives than stars with _________ mass.

Front 9

binary stars

Back 9

a star system that contains two stars

Front 10

milky way galaxy

Back 10

the spiral galaxy that contains our solar system

Front 11

spectrum

Back 11

a range of colors formed when white light passes through a prism

Front 12

What are both reflecting and refracting telescopes designed to do?

Back 12

gather and focus visible light

Front 13

spectrograph

Back 13

determine a stars temperature and chemical composition

Front 14

parallax

Back 14

method used to determine a star's distance from Earth

Front 15

3 ways stars are classified

Back 15

size, brightness, and temperature

Front 16

What color are the hottest stars?

Back 16

blue-white

Front 17

Hertzsprung-Russell diagram

Back 17

a graph that shows main sequence stars increasing in brightness as they increase in temperature

Front 18

A star is born when,,,

Back 18

nuclear fusion starts.

Front 19

nebula

Back 19

a large amount of gas and dust spread out in an immense volume; what all stars begin their life apart of

Front 20

gravity

Back 20

the force that pulls together the matter in stars

Front 21

supernova

Back 21

the explosion of a dying giant or supergiant star

Front 22

What do stars first become when they begin to run out of fuel?

Back 22

red giants or supergiants

Front 23

type of light humans can see

Back 23

visible light

Front 24

radio telescope

Back 24

device used to detect radio waves from objects in space

Front 25

irregular galaxy

Back 25

a galaxy that does not have a regular shape

Front 26

wavelength

Back 26

distance between the crest of one wave and the crest of the next wave

Front 27

absolute magnitude

Back 27

the brightness of a star if it were a specific distance from Earth

Front 28

black holes

Back 28

the remains of the most massive stars when they die...they get pulled into a small volume by the force of gravity

Front 29

spiral galaxy

Back 29

a galaxy with arms that spiral outward, like a pinwheel

Front 30

elliptical galaxy

Back 30

a galaxy that looks like flattened balls; contains only old stars

Front 31

quasars

Back 31

distant galaxies with giant black holes at their centers

Front 32

refracting telescope

Back 32

uses convex lenses to gather a large amount of light and focus it onto a smaller area

Front 33

convex lens

Back 33

a piece of transparent glass, curved so that the middle is thicker than the edges

Front 34

galaxy

Back 34

a giant structure that contains hundreds of billions of stars

Front 35

observatory

Back 35

a building that contains one or more telescopes

Front 36

universe

Back 36

all of space and everything in it