how long do they usually last?
2007-04-03 15:38:59 · 6 answers · asked by blue october 3 in Science & Mathematics ➔ Astronomy & Space
From the start of the blast it takes only fractions of a second to erupt and destroy the star. But the light, heat, radiation, and shock waves can last for months or even years before it dims down to pre-nova visibility.
2007-04-03 15:53:04 · answer #1 · answered by Anonymous · 3⤊ 0⤋
Supernovas are depending on the mass of the sun. If its like our sun and we are in earth it could be 20thousand year approximately. if ur counting in human life it could take generations. if we are on mars thing will go little different so time is uncountable if we travelling through universe. This is my opinion so dun use it for ur exams maybe wrong:)
2007-04-03 22:51:12 · answer #2 · answered by vignes 3 · 0⤊ 2⤋
They can last for months; short ones will last 'several weeks'. The exact duration depends on the type.
The explosion itself is very brief. All kinds of radioactive isotopes are produced during the explosion and it is the energy of their decay that produces the light we see for weeks (or months, depending).
2007-04-03 22:50:55 · answer #3 · answered by Raymond 7 · 0⤊ 0⤋
They usually take a few days to rise in brightness and many months to fade away again.
2007-04-03 22:47:44 · answer #4 · answered by campbelp2002 7 · 0⤊ 0⤋
http://en.wikipedia.org/wiki/Supernova
2007-04-04 06:20:01 · answer #5 · answered by neutron 3 · 0⤊ 0⤋
Depends on the size of it. Could be from mere seconds to thousand of years.
2007-04-03 22:45:17 · answer #6 · answered by fajarpri 1 · 0⤊ 1⤋