And, the only supernovae close enough to allow astronomers to study them in detail all happened over 400 years ago, before the telescope was even invented.
(the only supernovae close enough to allow astronomers to study them in detail; happened; T:over 400 years ago; T:before the telescope was even invented) (the telescope; was even invented; )
the only supernovae close enough to allow astronomers to study them in detail the telescope
happened was even invented
T:over 400 years ago T:before the telescope was even invented