Slightly offtopic, but what extraordinarily well done alt text for the major images on this page. An example:

> "The most current map of the Milky Way is shown in an artist’s representation. The Sun is directly below the galactic center, near the Orion Spur. The Scutum-Centaurus arms sweeps out to the right and above, going behind the center to the far side."

They aren't quite following best practices with attribute usage, a screenreader may read both the alt and the title text for example and they're the same here, but to have the level of detail is really commendable.