It's regularly detecting exoplanets down to slightly less than Earth-sized now, so assuming the orbits happened to be aligned the right way to make transits det

It's regularly detecting exoplanets down to slightly less than Earth-sized now, so assuming the orbits happened to be aligned the right way to make transits detectable at all, it should be able to detect all the planets except Mercury and Mars. Our hypothetical alien astronomers would put us down as a six-planet system, possibly worth a paper or two and a page in Alien Wikipedia :)