Space and astronomy news
has always been plagued by uncertainty. With only one habitable planet and one technologically advanced civilization as examples, scientists are still confined to theorizing where other intelligent life forms could be . Sixty years later, the answer to Fermi’s famous question remains unanswered. On the plus side, this presents us with many opportunities to hypothesize possible locations, activities, and technosignatures that future observations can test.
,” recently appeared online. For their study, the team considered how traditional Percolation Theory could be interpreted in terms of a, where a population’s per capita growth rate gets smaller as population size approaches a maximum imposed by the limits of local resources .In brief, Percolation Theory describes how networks behave when nodes or links are removed, wherein they will break down into smaller connected clusters.
A dark energy-dominated Universe describes the latest phase of cosmic evolution, which began roughly 9.8 billion years ago and is characterized by an accelerated rate of expansion. The team also considered all three scenarios in terms of a Logistic Growth Function to determine the number of planets settled with time.
“Remarkably, when the space itself is expanding as in the dark-energy and matter-dominated Universes, the process of settlement, for the most part, still follows the Logistic Growth Function. We did not expect this result because a system with expanding space appeared to us as vastly different from a static system. Most of the studies we know on percolation are based on a static lattice where the logistic growth behavior is usually observed.
To that, the team concludes that our galaxy may currently be in Phase I, characterized by a slow settlement rate. This could be because only a few intelligent, advanced civilizations are engaged in interstellar settlement right now. “This slow phase can be exacerbated by large distances between”living” planets. But once some number of traveling civilizations is reached, we may enter Phase II, characterized by a fast settlement rate.
“Given enough technology to travel near the speed of light, it is still challenging to reach any planet in the Universe, particularly the far away planets. Having said this, there is a spherical section of this Universe, centered in our location, whose planets are reachable, at least in principle, for possible settlement. Beyond this are planets that “move” away from us at a speed higher than that of light and may not be reachable.
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