====== 5. Chemical Age ======


===== - Seas and Atmosphere =====


{{:bn:courses:ast100:oxygen.webp?nolink&800|}}


===== - Periodic Table =====


[[https://pubchem.ncbi.nlm.nih.gov/periodic-table/|{{:bn:courses:ast100:periodic-table.webp?nolink|}}]]



{{:bn:courses:ast100:starfurnace.webp?nolink|}}


===== - Life on Earth =====



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{{:bn:courses:ast100:dna.webp?nolink&800|}}


===== - Habitable Zone =====


{{:bn:courses:ast100:habitable-zone.webp?nolink|}}



{{https://upload.wikimedia.org/wikipedia/commons/thumb/f/fb/Diagram_of_habitable_zone_rocky_exoplanets%2C_from_NASA_Exoplanet_Archive_and_Gaia_DR3_data.png/1280px-Diagram_of_habitable_zone_rocky_exoplanets%2C_from_NASA_Exoplanet_Archive_and_Gaia_DR3_data.png?nolink}}



===== - Searching for Life =====


{{:bn:courses:ast100:spectra.webp?nolink|}}



{{:bn:courses:ast100:transmission-spectra.webp?nolink|}}