Robert McNees on Nostr: Astronomer Ejnar Hertzsprung was born #OTD in 1873. The Hertzsprung-Russell diagram ...

Astronomer Ejnar Hertzsprung was born #OTD in 1873.

The Hertzsprung-Russell diagram plots the luminosity of stars vs their surface temperature. The vertical axis is luminosity, low to high moving upwards. The horizontal axis is temperature, from higher to lower reading left to right.

Emoji H-R diagram!

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