Burninator05 t1_jdszrsn wrote
Reply to comment by 008Zulu in Scientists discover supermassive black hole that now faces Earth by Bcap2219
Except that it could be a year away and we wouldn't know it until it got here.
RideIntelligent5154 t1_jdtamz2 wrote
We wouldn't know when it got here either …
008Zulu t1_jdt012q wrote
We can detect bursts of radiation from stellar objects, sometimes with millions of years advance.
bunnnythor t1_jdt2myi wrote
How? Radiation propagates at light speed, doesn’t it?
knotacylon t1_jdt6o20 wrote
No, we detect the remnants of these bursts that happened millions of years ago that are just now reaching us
Illithid_Substances t1_jdtxm83 wrote
What do you mean "millions of years advance"? We usually see things millions of years after they happen, and never before
008Zulu t1_jdu6ftu wrote
Meant to say away, no idea why I typed advance.
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