a: supernova ~
b: a giant onion
What:
"With two specks to go on, Haenecour tackled the difficult problem of calculating how a supernova might have produced silica grains. Before it explodes, a supernova is like a giant onion, made up of concentric layers dominated by different elements."
Useful?
Writer: Not Stated
LCC:
Where:
Date: Nov 18 2017 5:41 PM
# 11621 Critique Analogy