“In an undistinguished part of the universe (the outskirts of the Virgo Supercluster), in an undistinguished galaxy (the Milky Way), in an… — Neil deGrasse Tyson Copy Share Image
“But high-mass stars fortuitously explode, scattering their chemically enriched guts throughout the galaxy. After nine billion years of such enrichment, in an… — Neil deGrasse Tyson Copy Share Image
“For the first billion years, the universe continued to expand and cool as matter gravitated into the massive concentrations we call galaxies.… — Neil deGrasse Tyson Copy Share Image
