Lack of New Star Appearances
Why do we not see new stars every night when the light from
far away stars reach us for the first time? We are not seeing more and
more new ones. Why?
Good question. We do occasionally see light from brand "new stars" only
they are really old ones, novae and supernovae. Tycho's star, whose light
reached us in November 1572, actually left the exploding star centuries or
millennia earlier. There is a new star in Orion whose light recently
reached us in the 1930s; maybe it is just turning on. But it really lit up
1500 years ago.
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Update: June 2012