You will know that the first stars and galaxies formed when the Universe was ~400 Myr old and will understand the observational evidence for this. You will know that the first stars contained no heavy...You will know that the first stars and galaxies formed when the Universe was ~400 Myr old and will understand the observational evidence for this. You will know that the first stars contained no heavy elements, making them different from later generations of stars You will understand the physical conditions under which the first stars formed