more typical of Type II supernovas, such as SN 1054 which created the Crab Nebula. A shell of gas is still expanding from its center at about 9,000 km/s. A recent study indicates a rate of expansion below 5,000 km/s.

Companion star

In October 2004, a letter in Nature reported the discovery of a G2 star, similar in type to our own

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