GAIA Hertzsprung–Russell Diagram

Based on the April 2018 [astrometry data release](https://www.cosmos.esa.int/web/gaia/gaiadr2_hrd) from the [Gaia space observatory](https://en.wikipedia.org/wiki/Gaia_(spacecraft)), the [Hertzsprung–Russell diagram](https://en.wikipedia.org/wiki/Hertzsprung%E2%80%93Russell_diagram) plots the brightness of stars on the y-axis, and the temperature on the x-axis. Most stars, like our sun, fall on the main sequence along the diagonal. Bright but cold objects are often red giants. At the other extre