To play, you’ll need to wait a moment (30 seconds) while the galaxy data loads.

When the colours appear in the upper box, click and move your mouse around. The spectra will play, and be shown in the lower box.

NB: If you don’t see a grey and a black box above and the word ‘Loading…’ almost immediately… 

1. This works best on Chrome or Firefox, not IE or Safari yet.
2. If you have ad blockers, they may stop it loading. If so, the easiest workaround is to open an ‘incognito/private’ window.