2014年1月3日 Science/ A4 B0 \* N( p3 b% b: P& _! y: v5 T2 L y ! ?$ Z/ K3 q- ^" E. _) |: c
COVER Artist's conception of gamma-ray burst (GRB) 130427A, one of the 5 ~( ^6 w: H3 c, ~7 D1 ?0 zbrightest and longest-lived GRBs observed to date. GRBs such as this one occur 6 ^) Q! _4 I$ A+ |8 [/ K1 c
when the core of a massive star runs out of nuclear fuel, collapses, and forms a ( q1 r# [+ A, M, n: a9 ^, a( x# t
black hole that drives a powerful jet of plasma traveling close to the speed of + K' \" z1 z. E# ^2 k6 w7 e( Tlight. See pages 34, 38, 42, 48, and 51. Image: . e3 |' Z/ j! U" bNASA/Fermi and Sonoma State University/Aurore Simonnet 9 o+ @& M, i- [( h. q- H% Z . D4 g/ e V5 o8 G3 @1 V! L作者: 懵懂干细胞 时间: 2014-1-5 21:56