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Some Harvard scientists have speculated that these things (which have been discovered a number of times now and appear may be quite common) are the result of interstellar alien probes being pushed by monumental lasers directed at their sails.
One of the scientists who discovered this recent event thinks this is unlikely, because they seem to come from different galaxies, and so it would be highly improbable that all these different alien civilizations had the same method of transport.
I don't know about that, but I do understand the implication of us discovering a number of alien civilizations all of whom are billions of years away in vastly remote galaxies.
It would mean the chances of there being any other civilization in our galaxy is close to zero, or even in any of the other galaxies in our 'local' universe.
And given that this technology, although incredibly advanced, would probably be achievable with us within a few thousand years given the exponential progress of technology, it would also have the implication that we will almost certainly wipe ourselves out before then. In other words, intelligent civilizations like ours are very common, but we wipe ourselves out nearly every time before we reach the point of developing technology like this.
And if you believe the Singularity hypothesis, which holds that the exponential growth of technology, when applied to A.I., will lead to a point when technological advances go off the scale and a 1,000 years progress is made in one hour (when A.I. becomes so advanced it can immediately design even more advanced A.I. than itself), which many predict to happen this century the implication is we wont survive it.
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