Can humans REALLY colonize Mars?

Yes, humans can colonize Mars, but there are some issues that we would need to get around. Let's say you launch a rocket into earth-orbit, then from there, fired your engines to put yourself on a trajectory to rendezvous with Mars sometime within the next few months. Sure, you can arrive at Mars, and land, as long as you have a heat shield to survive atmospheric entry and engines that you can start up to touch down safely, but you need a way to get back to Earth, and you also need a way to communicate with Earth. Mars orbits farther away from the Sun than Earth does, so the 2 planets' orbits are not in sync. Mars orbits slower than Earth, so at one point, Mars and Earth will be exactly horizontal from each other, like this image below. The sun is now in between Earth and Mars, so you don't really have a way to communicate, as our huge star, The Sun, is right in the way for our antennas on Mars to communicate with ground stations or satellites on or around Earth. This means,