1. Rapid expansion of Crab Nebula
2. Historical records from China
3. Existence of binary stars
4. Existence of iron on earth
2007-12-20 06:11:51 · 5 answers · asked by J E M 5 in Science & Mathematics ➔ Astronomy & Space
The correct answer is #3.
The Crab Nebula is a supernova remnant.
The Chinese witnessed this supernova on or about July 4, 1054 A.D. The explosion was so bright, it was visible during daylight!
Iron is forged in larger stars, and released into the surrounding space in a supernova.
I hope this helped!
Clear Skies!
B
2007-12-20 06:18:10 · answer #1 · answered by Bobby 6 · 2⤊ 0⤋
3. Binary stars have nothing to do with supernovae. The other 3 answers do. Elements heavier than Iron had to be formed in a supernova just to exist here. Chinese records and the Crab nebula affirm a supernova explosion in our galaxy.
2007-12-20 20:28:56 · answer #2 · answered by Thomas E 7 · 0⤊ 0⤋
#3
2007-12-20 14:22:10 · answer #3 · answered by Chug-a-Lug 7 · 1⤊ 0⤋
The best answer is #3
2007-12-20 14:15:24 · answer #4 · answered by Anonymous · 1⤊ 1⤋
#5
2007-12-20 14:24:30 · answer #5 · answered by Andrew 3 · 0⤊ 1⤋