Power = energy / time
Over 250,000 years, the sun would release P * 250,000 years * 365 days/year * 24 hour/day * 3600 sec/hr = 7.88 * 10^12 times the energy our sun puts out in 1 sec. this was also released in 0.2 sec so the power = P * 7.88 * 10^12 / 0.2 = P * 3.94 * 10^13 of what our sun puts out.
Quite the energetic 'object'
If P is the average power output of our sun, what was the average power output (in terms of P) of this magnetar?
On December 27, 2004, astronomers observed the greatest flash of light ever recorded from outside the solar system. It came from the highly magnetic neutron star SGR 180-20(a magnetar). During 0.20 s, this star released as much energy as our sun does in 250000 years.
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