50 Greatest Mysteries of the Universe (gnv64)

Astronomy Magazine - 50 Greatest Mysteries of the Universe
English | PDF | 100 pages | 60.4 mb

CONTENTS
A universe of limitless wonder .................. 6
1 . How old is the universe? .................... 8
2 . How big is the universe? ................... 10
3 . How did the Big Bang happen? ............. 12
4 . What is dark matter? ....................... 14
5 . How did galaxies form? .................... 15
6 . How common are black holes? ............. 17
7 . How many planets are in the solar system? .. 19
8 . Are We Alone?........................ 21
9 . What is the fate of the universe? ............ 23
10 . What will happen to life on Earth? .......... 24
11 . What is dark energy? ....................... 26
12 . What are gamma-ray bursts? ............... 28
13 . Will asteroids threaten life on Earth? 30
14 . Is water necessary for life? .................. 32
15 . Is there life on Mars.Titan. or Europa? ....... 34
16 . Why did Mars dry out? ..................... 36
17 . How did the Moon form? ................... 37
18 . Where do meteorites come from? .......... 39
19 . Can light escape from black holes? ......... 40
20 . Did stars. galaxies. or black holes come first? ................................. 42
21 . Where do cosmic rays come from? .......... 44
22 . How are comets and asteroids related? ..... 46
23 . How many planets surround other star systems? .............................. 48
24 . How many asteroids are locked up in the Kuiper Belt? ............................ 50
25 . Does string theory control the universe? .... 52
26 .What creates gravitational waves? .......... 54
27 . What happens when black holes collide? ... 55
28 . Why does antimatter exist? ................. 57
29 . Are there other planets like Earth? .......... 58
30 . Does every big galaxy have a central black hole? ......................... 60
31 . Does inflation theory govern the universe? . . 62
32 . Should Pluto be considered a planet? ...... 64
33 . Why did Venus turn itself inside.out? ....... 66
34 . How could we recognize life elsewhere in the cosmos? ............................. 69
35 . What created Saturn's rings? ............... 70
36 . Could a distant. dark body end life on Earth? .................................. 72
37 . Do we live in a multiple universe? .......... 74
38 . How did the Milky Way Galaxy form? ....... 75
39 . How did the solar system form? ............ 77
40 .What happens when galaxies collide? ...... 78
41 . How do massive stars explode? ............ 80
42 . What will happen to the Sun? .............. 82
43 . Did comets bring life to Earth? ............. 84
44 . How did quasars form? ..................... 85
45 . Will the Milky Way merge with another galaxy? .................................... 86
46 . How many brown dwarfs exist? ............ 88
47 . What happens at the cores of galaxy clusters? ............................ 90
48 . Is Jupiter a failed star? ...................... 92
49 . How many galaxies are in our Local Group? . . 94
50 . Do neutrinos hold secrets to the cosmos? ... 96

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