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Not quite sure what you mean by 'we are all made of stars?'.The Earth is not so much made of a star, as part of a star (we are part of the atmosphere of our Sun).If by 'made of stars', you are talking about the super nova explosion that is suggested may have triggered the creation of the solar system (of which the visible Sun, and all the planets within are a part of), then at present the theory seems still to be in its infancy, and I don't think anyone has yet traced any possible black holes, or neutron stars, or other residue, that they would suggest is a candidate for the remnant of such a supernova.
So, there must a neutron star or a black hole floating around out there somewhere !!
Is there any serious alternative suggestion to a supernova for creating all the heavy elements?
The conditions during a supernova are just right.
Just right means hot enough and with enough pressure, of course.
But now I see the meaning of the orig question. The 'inside' remains of that supernova would be very hard to spot but, as it would be relatively near, (Probably the nearest big black lump to us?) there is a chance of it turning up in some observations. I guess gravitational lensing could reveal it.I suppose you could expect to find stuff in orbit around it, too - also invisible, though.
. . . .then I would have thought the explosion would have created a number of stars, not merely our Sun, so it may be possible to try and model the process . . . . .
I had always pictured the nebulae as condensing into themselves to produce the new stars, 'locally'.