Simulate Space in less than 30 lines of Code

main.lua

starCtr = 0
stars = {}
currTransSpeed = 500
displayHeight = display.contentHeight
math.randomseed( os.time() )

local function removeMe() --remove stars after reaching end of screen
	for i=1,1100 do
		if stars[i] ~= nil then
			if stars[i].y >= displayHeight then
				display.remove( stars[i] )
				stars[i] = nil
			end
		end
	end

	if starCtr >= 1000 then
		starCtr = 0
	end
end

local function loadSpace() -- create starts and move them
	starCtr = starCtr + 1
	local currX = math.random( 1,display.contentWidth)
	local currY = math.random( 1,display.contentHeight)
	local currRadius = math.random( 1,2)
	stars[starCtr] = display.newCircle( currX, currY, currRadius )
	transition.to( stars[starCtr], {y=display.contentHeight + currRadius,time = currTransSpeed,onComplete = removeMe} )
end

local function startSpace()
	timer.performWithDelay( 10, loadSpace , -1 )
--	timer.performWithDelay( 5000, loadPlanet , -1 )
end

startSpace()