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Cosmology: The History and Nature of Our Universe S1 Ep2: Denizens of the UniverseIntroducing the hierarchy of structures in the universe; from planets to stars, galaxies, galaxy clusters and larger groupings of galaxies called the cosmic web; light travels at a finite speed, looking far away also means looking far back in time.

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Now PlayingCosmology: The History and Nature of Our Universe S1 Ep2: Denizens of the UniverseIntroducing the hierarchy of structures in the universe; from planets to stars, galaxies, galaxy clusters and larger groupings of galaxies called the cosmic web; light travels at a finite speed, looking far away also means looking far back in time.0Unlocking the Hidden History of DNA S1 Ep1: Genes versus DNAInvestigating the independent discoveries of genes and of DNA in the mid-1800s; following both trails into the 20th century, as chromosomes are discovered and the realization finally begins to dawn that genes and DNA may be related.