3 ms·
It's not missing though, is it? It has the characteristic of having effects of mass but not being otherwise observable.
by tcskeptic 5y ago
It's not missing though, is it? It has the characteristic of having effects of mass but not being otherwise observable.
- ASalazarMX 5y agoOther comments have suggested better names, based on the fact that we don't even know for sure that it's matter, just that gravity at large scale doesn't behave like it should.