I said you can't use outer space to prove constellations exist, but you're telling me to look out at space to see constellations. By Objectivist's reasoning, that would not prove constellations exist.
Also, material entities such as the sky and keyboards are not the only things which are real and true. Just because you can't see something does not conclude it doesn't exist. The wind is an immediate example of that.
In fact, there are immaterial realities in the universe which are very near to our human perception and important to our existence. No one can see logic, love, liberty, or life because they are conceptual in nature. Nonetheless, they do exist and are very real. The same applies to God. He is by nature immaterial or spiritual, but He is very real to human perception and existence, just not in an empirical way.