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Bhaktivedanta VedaBase: Srimad Bhagavatam 1.7.30
avritya rodasi kham ca
samhatya -- by combination of; anyonyam -- one another; ubhayoh -- of both; tejasi -- the glares; sara -- weapons; samvrite -- covering; avritya -- covering; rodasi -- the complete firmament; kham ca -- outer space also; vavridhate -- increasing; arka -- the sun globe; vahni-vat -- like fire.
When the rays of the two brahmastras combined, a great circle of fire, like the disc of the sun, covered all outer space and the whole firmament of planets.
The heat created by the flash of a brahmastra resembles the fire exhibited in the sun globe at the time of cosmic annihilation. The radiation of atomic energy is very insignificant in comparison to the heat produced by a brahmastra. The atomic bomb explosion can at utmost blow up one globe, but the heat produced by the brahmastra can destroy the whole cosmic situation. The comparison is therefore made to the heat at the time of annihilation.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupada, Founder Acarya of the International Society for Krishna Consciousness