Cosmic rays are highly energetic radiation (mostly atomic nucleus) outside the Solar System travelling through space at the speed of light (and the speed could just be close to the speed of light). Take this quiz to find out more.
3 million
5 million
7 million
10 million
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Electron volts
Proton volts
Neutron volts
None of the above
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2
3
4
5
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InsideÂ
Outside
Both outside and inside
A little outside but mostly inside
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80
85
90
95
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60
70
80
90
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1910
1911
1912
1913
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30
50
70
100
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83
87
92
95
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