Transcript Study Notes for Chapter 30:

Study Notes for
Chapter 30:
Stars, Galaxies, and the Universe
1

A galaxy is made of stars, dust, and gas bound
together by ______.

gravity
2

A large, bright star whose hot core has used
most of its hydrogen is a _____.

giant
3

A light-year is the distance ____ travels in a
year.

light
4

A small, hot, extremely dense core left after a
star collapses is a _____ dwarf.

white
5

A star moving away from the Earth has a
spectrum that is shifted toward ______.

red
6

A star with the sun’s mass would stay on the
_____ sequence of the H-R diagram for about
10 billion years.

main
7

A white ______ is a hot, extremely dense core
of matter left after a star _______.


dwarf
collapses
8

About ______ stars are visible from Earth
without a telescope.

6,000
9

______ magnitude is the true brightness of a
star.

Absolute
10

After its temperature rises to 10,000,000°C, a
_____ becomes a star when nuclear fusion
begins.

protostar
11

_______ magnitude is the brightness of a star
as it appears from Earth.

Apparent
12

Astronomers believe that cosmic background
_______ formed shortly after the big bang.

radiation
13

By analyzing the light that a star emits,
astronomers can determine the ______ and
________ of a star.


composition
temperature
14

During the main sequence stage, ______ fuses
into ______ to generate energy in a star’s core.


hydrogen
helium
15

Hubble’s discovery that there was ____ shift in
the spectra of galaxies lead to an
understanding that the universe is ____.


red
expanding
16

Many astronomers believe that black _____ do
not exist.

dwarfs
17

Most of the universe is made of _____ energy
and dark _______.


dark
matter
18

Red shift in the spectra of galaxies told
______ that the universe is expanding.

Hubble
19

Scientists determine the composition and
temperature of stars by analyzing the
________ of the light that stars emit.

spectra
20

Stars _____ to move in the sky because
______ is moving.


appear
Earth
21

The ____ bang occurred about __ billion years
ago.


big
14
22

The ____ stars are ____ in color, the hottest
stars are _____.



coolest
red
blue
THE END