Hehe. No problem. Gonna have a try at the Orion Nebula and also a go at Theia hitting Earth 4.5Bn years ago? Might take a lot of research that though to make it convincing that it is indeed Earth as it may have looked at the time of the epic impact... Scientists say that Theia was about the size of Mars; and Earth was less the Moons, and Theias masses combined; relatively speaking, (as the Moon only existed after the epic impact between Earth and Theia). It should help you with a sense of scale if you look up the sizes that they are today. Sorry if I seem presumptuous - I just really like your work. I also think Link 1 [link] Bill Hartmann Link 2 [link] would be proud of your work, (envious too, his isn't QUITE as good as yours).