When was space invaders made

jordan leadbetter made it in 2003 , ALIEN....

Nice answer kevin, but here's a better one:

I thought it was established in the era of 'E.T' - the floating, green, slap-headed alien. Evidence has proved that it was created in the 70's (space invaders) and E.T. in the 80's. Both similar alien feature designs. There are also traces of alien inheritance in human DNA.