In Ogame when i try to colonize a planet it says i need to research more astrophysics even though i have level three and you only need level one why does this happen

You must be trying to colonize a planet which is from 1 to 3 or 13 to 15 in galaxy for these planets you need astrophysics in level 5 till 7 so you have to colonize a planet between 1 to 12