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Originally Posted by Johnny Rotten
So. As you go up the periodic table, you encounter heaver and heavier elements. As you get to the ones at the top, you encounter atoms that, while unstable and not naturally occurring on Earth, have an SNF that actually extends beyond the range of their orbiting electrons...
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Emphasis mine.
The problem with this is that these unstable atoms don't naturally occur anywhere. That's not specific to Earth. They can't occur naturally; even when we create them artificially they destabilize and break up within thousadnths of a second. Until we can figure out a way to stabilize them, hypothesizing what we could do with them is entirely useless.
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Originally Posted by Johnny Rotten
What I can tell you is that relativistic speeds give cosmic dust the penetrative properties of high-speed torpedoes. So if anyone is visiting from another star system, they're certainly not getting here through linear means.
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I actually did make a concession to this, when I mentioned that they'd need a vessel capable of withstanding the stresses of interstellar travel. This is specifically what I was considering, since the stress of acceleration and deceleration can be mitigated by extending the time frame. Regardless, I think if we're going to assume that our advanced alien civilization is capable of accelerating to relativistic speeds in the first place, we can safely assume that they're probably capable of handling this problem as well.
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Originally Posted by Johnny Rotten
But if intelligent life is abundant, the chances of similar morphology increase. In fact, it's reasonable to deduce that the intelligent creatures with morphology close to our own would be the ones most interested in dropping by for a visit. To scout for resources and habitation, if nothing else. And they can judge this at interstellar distances, just by measuring the emitted spectra of the sun.
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You're basing this entirely on an unsupported assumption. We have no evidence that intelligent life is abundant, so any line of reasoning based on that is idle conjecture.
Also, stellar spectrometry only reveals information about the star in question and not it's orbiting planets. We can use that information to deduce what
may be there, but can say nothing conclusive about what
is there.