- #1
- 3,401
- 3
Today's Astronomy Picture of the Day is a photograph showing a rainbow ring, inside of which is a bright region. APOD also carries a challenge - what is the explanation for sequence of colours and the bright region?
Surprisingly, lots of bright students, knowledgeable teachers - even the APOD editors - apparently haven't got it (yet).
Surprisingly, lots of bright students, knowledgeable teachers - even the APOD editors - apparently haven't got it (yet).