To conclude through reasoning from something known or assumed is to

Infer.

Explanation:

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In this case, when we conclude through reasoning from something known or assumed is to infer, as we all make inferences which come from conclusions by using information we have to obtain new information. When we infer, we connect the facts from the known to the unknown, from the stated to the unstated. To infer turns out into a logical conclusion based on an analysis of stuffs, circumstances, situations, facts, and conceptions that seem reliable in light of what is known.

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it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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i believe that it is a exoplanet