Hi everyone. I would like to apologise in advance for my inherent lack of information in regards to what I am about to ask. I do not have a great understanding of the physics of the universe and such, but I suppose that is partially the reason for forums - to expand knowledge! Anyway, I would like to pose a question that I hope someone could answer for me. I am planning to write a science fiction novel soon, but one thing I am attempting to do (that I think many others fail to do, be it novelists or screenwriters) is use as much real science as possible. While there are leaps and bounds such as faster-than-light travel, I want the science of the story to be as plausible and believable as possible. The story involves a journey to a habitable planet near the Rosette Nebula. Now, the question I would like to pose is this. Young stars within nebulae obviously emit radiation while forming (and throughout their lifetime). An entire nebula of young stars would no doubt be rather dangerous in this regard. How far away would a planet need to be from such a nebula in order to have Earth-like conditions for life to evolve? Obviously if it were too close to the nebula (and in this case, the Rosette has a radius of 65 light years), I'm speculating the planet's magnetic field and ozone layer would be insufficient to protect the planet from so much radiation, if it were too close? On a personal note, it does make one wonder what a nebula like the Rosette would look like from the surface of a planet, especially at night. I imagine it would be quite a beautiful sight! Any help will be appreciated!