per OP, signal reached T.C. in 1998
T.C. is ~12 ly away
if they responded that year we’d have got the message in 1998 + 12 = 2010
that was 15 years ago
per OP, signal reached T.C. in 1998
T.C. is ~12 ly away
if they responded that year we’d have got the message in 1998 + 12 = 2010
that was 15 years ago