Sorry if this is a dumb question, but I wanted to ask you, is the planets in orbiter such as the Planet Earth is the correct size as it is in real life? Thanks!
Yes they are. That's why the planets appear in the right spots and things like the phases of the moon correspond to real life.
Edit to add: It's also why you can use the same launch windows in orbiter as in real life. The orbiter solar system matches up with the real one with almost perfect precision.