Fusion reaction power the blank in space. humans currently use fusion in blank, but erases hers are seeking more applications
1st blank (asteroids, planets, sun and the stars)
2nd blank (electric power plants, steel production, weapons)

-- sun and the stars

-- weapons

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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