What is the level of risk associated with rejecting a true null hypothesis called?

The level of risk associated with rejecting a true null hypothesis called type I error or false negative.
It happens when you saying the null hypothesis is false when it is in fact true. The cause of this error can be varied. Making a control or reducing bias is important to reduce this error.

The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11

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