Are You Ready to Start Some Life Under That Star?

The universe so far is just hydrogen and helium. All you can do are form denser, or less dense blobs of hydrogen and helium in order to make rocky planets. Then you need heavier elements in the universe, and that happens at the heart of stars. The elements that became the earth were not made in our sun, of course. They were made in a previous sun that burned for billions of years. But in the first round of stars, there was nothing else. So you can't have a rocky planet around those first stars.