The Scale Of Our Universe

I need to stop with miscrosoft paint, any suggestions of free good softwares.
----------------------------------------------------------------------------------------------------------------For the astronomy nerds like me. Everyday do you consider where we are on this map? I made it yellow. What do you know? Just a small spec. But we are probably the greatest species known to aliens (if they exist.) If aliens have TRAVELED TO THEIR MOON, we just need to wonder how far they are in future tech. Anyway yeah most of this art was to display a cubone constellation I made up.