Random Questions

[Sardia]

Can someone explain to me what each kind of scanners do? What is the difference among basic, tachyon, long range etc etc.? Can I drop the basic sensors after I get some of these?

P.S. There is this annoying bug; if you select drop troops, you can't unselect if you hit it by mistake. Very annoying if you want to do something else, like capture a ship. Also stops you from selecting other ships, I think.