There are two things in the universe you can't get around: Temperature and gravity. So if you are in interstellar space you're at 2.7 degrees kelvin. Your atoms are hardly vibrating and you're not going to be alive. Life as we know it can't survive. So you have to be near a star. That's good, but stars have gravity and you can fall into them. Your only hope is to be near a star but not falling into it – you need an orbit. And that's magical.He named the planet after his wife:)
I'm not an expert in biology but when you read about the conditions under which life took hold on this planet – it was a terrible place 4 billion years ago, with no oxygen. Yet life came on the scene quickly. Something hit Earth so hard it broke off a chunk that created the Moon. And yet life kept coming back over and over again. You learn from that that it's hard to stop life.