# How could a supernova seed solar nebula?

If the heavier elements such as Uranium came from a supernova, then this supernova had to sit somewhere right in the middle of the original solar nebula, because although the ejected matter traveled extremely fast by star or planet standard, it was still not fast enough to truly get across the empty space between clusters of stars. Does this mean the supernova was actually birthed and died in the same nebula or at least in the immediate vicinity in a region that is rich in hydrogen? Could the solar system be still in this nebula? What could endow the solar system as a whole with so much momentum that it acquired a different trajectory around the galaxy than its mother nebula, if the solar nebula is in effect no where to be found?

• – PM 2Ring Mar 24 '19 at 8:16
• "it was still not fast enough to truly get across the empty space between clusters of stars." -- actually, it is. The Crab Nebula (from the supernova of 1054) is already about 11 light years in diameter, and it's only 1,000 years old; GSH 138-01-94 is a supernova remnant that's about 4 million years old and 1,000 light years in diameter. – Peter Erwin Mar 25 '19 at 13:53

However, it is possible that one or two local supernovae did imprint a pattern of odd abundances for particularly rare or short-lived (radioactive) isotopes. It is widely believed that an explanation for the inferred high ratio of $$^{26}$$Al/$$^{27}$$Al (the former being radioactive with a half-life of less than a million years) in the early solar system, indicates that it was enriched by the ejecta from a nearby supernova. This may suggest that the Sun was born in a cluster of stars that was numerous enough to have contained very high mass stars capable of exploding as supernovae on short timescales.