How to make an expanding part? [closed]

So i am creating a nuke and i already made the nuke itself but I want to make an explosive wave that expands outwards. I have no idea how to create a part that expands. Until I figure this out im just gonna go with this:

nuke = script.Parent
cooldown = 10
canExplode = true

function boom(custom)
    timer = game.ServerStorage.beep
    timer:play()
    wait(1)
    timer:play()
    wait(1)
    timer:play()
    wait(1)
    pew = Instance.new("Explosion")
    pew.Parent = nuke
    pew.Position = nuke.Position
    pew.BlastRadius = 100
    pew.ExplosionType = "NoCraters"
end

nuke.Parent.Button.ClickDetector.MouseClick:connect(boom)