This following takes time and effort to get our heads around, yet
fascinating, for those who like cosmic considerations.
.....Step 1} XYZ > abc + d { radii aka volumetric diagonal }
= hyper-dimension aka hyper-space. Simple? Yes, however, this next
part is fascinating if you have the
time.https://en.wikipedia.org/wiki/Space_diagonal
Step-2} Ok so now we've entered the hyper-twilight-space-zone..do-do...do-do..do-do and this LINK is very eye opening mathematics, and many interesting finds ex sphere packing in 42 { Answer-to-Everything } dimensions is very special. https://www.youtube.com/watch?v=dr2sIoD7eeU
Step-3} So the above is very cool, but here is one that tests for extra-dimensions of Universe via gravity released from the famous merging of two neutron stars in August of 2017. Go to 9:00 of this next to understand what LIGO and VIRGO informed us about the existences or not, of extra-dimensions in our Universe. https://www.youtube.com/watch?v=3HYw6vPR9qU
Step-2} Ok so now we've entered the hyper-twilight-space-zone..do-do...do-do..do-do and this LINK is very eye opening mathematics, and many interesting finds ex sphere packing in 42 { Answer-to-Everything } dimensions is very special. https://www.youtube.com/watch?v=dr2sIoD7eeU
Step-3} So the above is very cool, but here is one that tests for extra-dimensions of Universe via gravity released from the famous merging of two neutron stars in August of 2017. Go to 9:00 of this next to understand what LIGO and VIRGO informed us about the existences or not, of extra-dimensions in our Universe. https://www.youtube.com/watch?v=3HYw6vPR9qU