The Mudcat Café TM
Thread #101453 Message #2046263
Posted By: JohnInKansas
08-May-07 - 01:26 PM
Thread Name: BS: only 238 million LY away-TAKE SHELTER!
Subject: RE: BS: only 238 million LY away-TAKE SHELTER!
If it blows now, we won't know it for another 7500 years
If we know that the eruption happened, then the eruption happened at least 7500 years ago.
If the supernova begins a week after the eruption, then we will see the results of the eruption in about a week, 7500 years after a week after the other thing that was 7500 years ago.
In astronomy, one must distinguish between the things that aren't really there, and the things that really aren't there at the time we learn that they are here because they were there.