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Is it ever specified when did Krypton explode considering Earth time?

I read that Superman took about three years to reach Earth, but I think it was considering the time at the capsule (which would change based on its speed).

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1903.. Just before launching Superman into Space, his father told his mother about recent invention of Mankind.. The Airplane. – Evil Angel Feb 12 '14 at 17:26
About 20-25 years before Clark made his first public appearance as Superman. Unless the ship cryogenically froze him, or sent him through a wormhole, or...y'know what? It happened a while back. It happened when the plot needs it to have happened. Or, of course, "When Superman was a newborn baby." – Jeff Feb 12 '14 at 19:32
up vote 7 down vote accepted

In the DCnU reboot:

27.1 years ago.

DC Comics teamed with Neil DeGrasse Tyson to find a star that would resemble Rao. In Action Comics #14, the light from Krypton's explosion was supposed to be visible from Earth. This news is related courtesy of CNET on November 6, 2012.

Tyson teamed with DC Comics to track down a Krypton-like system that matches hints from the comics. He found a fitting red dwarf in the constellation Corvus (the crow) in the southern sky, a mere 27.1 light years from Earth.Tyson even gets a cameo in Action Comics #14, "Star Light, Star Bright," when Superman makes a visit to the astrophysicist's planetarium.

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