| The spectral type of a star is a measure of its temperature. In order of
decreasing temperature, the types are labeled |
| O B A F G K M R N S |
| Princeton astronomer H. N. Russell's students composed this mnemonic for
remembering the order: |
| Oh |
Be |
A |
Fine |
Girl |
Kiss |
Me |
Right |
Now. |
Smack. |
|
| Astronomer Donald Hayes' version was |
| Oh |
Be |
A |
Fine |
Gorilla |
Kill |
My |
Roommate |
Now. |
Smash. |
|
| Another version, referring to a particularly annoying member of an
astronomy class about 35 years ago, was |
| Once |
Beaten |
Any |
Fool |
Gains |
Knowledge. |
Might |
Ronnie |
Need |
Smacking? |
|