Why? Because anything from the Uranium decay chain effectively dates the creation of those elements.
I belong to the school of thought that believes that spacefaring life is relatively rare. By "rare" I mean we may well be the only one within the Milky Way (within our light cone). There are lots of reasons for this but a lot of people have put a lot of thought into this but it's a whole separate topic.
Anyway, this then raises the issue of the Fermi Paradox. One angle might be the relative abundance of elements heavier than iron.
Elements up to iron are relatively common in the Universe because they're created by nuclear fusion. More specifically, nuclear fusion of elements up to iron produces energy.
Heavier elements are produced by supernovae or the merger of neutron stars and/or black holes (as we've detected by LIGO in recent years). It seems like a neutron star merger is almost required for the relative abundance of such elements we have on Earth. That might be one reason why spacefaring life is "rare".
I've seen some discussion of this for Earth-bound materials suggesting they were created 80-200 million years (IIRC) before the Earth was.
So I'm curious how old samples like these. Are they from the same event or do they have a different origin? Examining such samples from other parts of the Solar System may tell us about the relative likelihood of such events on cosmic timelines.