Hydrogen and helium came from the Big Bang; nearly everything else was forged inside stars. Fusion builds elements up to iron, and dying stars scatter them - the calcium in your bones was cooked in a stellar core. This is the real knowscape from knowhere, not a picture of one. Drag it. Watch what actually changes.
Every atom heavier than hydrogen was cooked somewhere, and light is the receipt. Stellar spectra, the HR diagram, fusion, nucleosynthesis — they're all one story read backwards: you catch light, decode where and how it was made, and reconstruct the whole assembly line from the Big Bang to the carbon in your hand.
Stars fuse light nuclei into heavier elements up to iron, where binding energy per nucleon peaks. Elements heavier than iron are built by neutron capture, in ageing giant stars, supernovae and neutron-star mergers, and all these materials are dispersed into space to form new stars and planets.
This concept has no prerequisites in knowhere's map — it is a root. Everything in the topic is built from here.
Each one is its own knowscape in the app — built for how a particular student takes things in, not one explanation handed to everybody.
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