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Those isotopes are found in igneous rock made from cooled magma.
They all have a half-life of more than a million years. The isotope’s needed to determine age are rarely found in sedimentary rock.They have devised many theories to try to explain it, each one failing after a brief period of popularity.The same "winding-up" dilemma also applies to other galaxies.That number is consistent with only about 7,000 years worth of supernovas..Yet each time a comet orbits close to the sun, it loses so much of its material that it could not survive much longer than about 100,000 years.
The gas and dust remnants from such explosions (like the Crab Nebula) expand outward rapidly and should remain visible for over a .