Astronomy Cast- What if things were different?

The number of moons, the age of the Sun, and our placement in the Milky Way all had an impact on the formation of the Earth and the evolution of life on our planet, but what if things were different? the lives of galaxies change as they go from low-density environments to high-density environments over the course of the history of the Universe. Over time, as the galaxies have swept one past the other, the gravity of them tearing at each other has sucked all the dust out into the spaces between the galaxies, and without dust there’s no star formation. Without star formation in one of the bigger galaxies such stars that form Orion's belt may not of been created. if our Sun had been one of that 0th generation of stars which formed pretty much 400,000 years after the Big Bang, it would have been giant. It would have been a runaway star because it wouldn’t have had any metals to help it cool off. That’s one of those strange things in star formation. This pretty much that we wouldnt be here right now.  there wouldn’t have been any of the stuff to make planets. Initially, it was hydrogen, helium, trace amounts of lithium, and beryllium none of the silicon we need to make rock, none of the iron we need in our blood, none of the metals at all existed initially so that first generation of stars if we’d been one of the first generation of stars, no planets would have formed. If we were closer to the core of our galaxy there would a higher risk of collision. The galaxy formed in such a way that made it ideal conditions for life to be sustainable on our planet.