Astronomy Magazine – 50 Greatest Mysteries of the Universe – eBook

A universe of limitless wonder ……………… 6
1. How old is the universe? ……………….8.
2. How big is the universe? ………………1.0
3 . How did the Big Bang happen? …………. 12
4 . What is dark matter? ………………….. 14
5. How did galaxies form? ……………….1.5
6. How common are black holes? ………….1 7
7 . How many planets are in the solar system? .. 19
9. What is the fate of the universe?. ………..2 3
10. What will happen to life on Earth?. ………2 4
11 . What is dark energy?. …………………2. 6
12 . What are gamma-ray bursts? …………… 28
13 . Will asteroids threaten life on Earth?. …….3 0
14 . Is water necessary for life?. …………….3.2
15 . Is there life on Mars.Titan. or Europa? ……. 34
16 . Why did Mars dry out? ………………… 36
17 . How did the Moon form?. ……………..3.7
18 . Where do meteorites come from? ……….3 9
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?. ………4 4
22 . How are comets and asteroids related? ….. 46
23 . How many planets surround other star systems? ………………………..4.8
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?. ……………5.7
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? …………..7. 0
36 . Could a distant. dark body end life on Earth?. ………………………….7.2.
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? …………8 0
42 . What will happen to the Sun? …………..8 2
43 . Did comets bring life to Earth? …………. 84
44. How did quasars form?. ……………….8.5
45 . Will the Milky Way merge with another galaxy? ……………………………8.6
46 . How many brown dwarfs exist? …………8 8
47 . What happens at the cores of galaxy clusters? ………………………. 90
48 . Is Jupiter a failed star?. ………………..9.2
49 . How many galaxies are in our Local Group? . . 94
50 . Do neutrinos hold secrets to the cosmos? … 96

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