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Signs of Life on a Distant Planet? Why Scientists Are Cautious About K2-18b
Level 2
Question 1 of 5
The result was reported at 'three-sigma.' What does that mean here?
A
About a 0.3% chance of being a fluke, which is suggestive but below the usual discovery bar
B
The result is completely certain
C
There is a 50% chance it is real
D
It means life was confirmed
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