[Trial]Galaxies
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Introduction
4
What is a galaxy?
6
How many galaxies are there?
8
what is a spiral galaxy?
12
What is an elliptical galaxy?
14
what is an irregular galaxy?
16
FOCUS ON peculiar galaxies
18
Do galaxies usually exist in groups?
20
How large are galaxies?
22
which is the most distant galaxy?
24
FOCUS ON the galaxy we live in
26
what is the nearest galaxy to ours?
28
do galaxies move around?
30
How fast does a galaxy move?
32
do galaxies ever merge?
34
FOCUS ON colossal collisions
36
who discovered that galaxies exist?
38
why does a galaxy glow?
40
how do astronomers use light to study galaxies?
42
how do astronomers count galaxies?
44
when did galaxies start to form?
46
how did galaxies form?
48
are new stars forming in galaxies?
50
are galaxies forming now?
52
FOCUS ON Gravity—a galactic glue
54
can galaxies die?
56
what are some remaining mysteries about galaxies?
58
glossary
60
for more information
62
Index
63
Acknowledgments
64
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