a reply to:
radkrish
I think that there are many possible answers to that question, and no one of them alone has the full weight of truth to carry them above the others
to a state of consensus grabbing reality.
For example, gas giants, having as they do, such massive density, are capable of attracting and redirecting huge amounts of space debris, and as it
happens, if our solar system lacked Jupiter and the rest, it would be a much more dangerous place in which to live, due to the larger numbers of
torpedoing space rocks that would be jetting across our planets orbit during a given year. Jupiter you see, attracts these objects, sometimes grabbing
them so entirely that they impact with its outer atmosphere, and sometimes giving them a nudge or a pull in such away as to see them flung clear out
of the solar system for a few thousand years.
But that is not the only mechanical purpose Jupiter serves. Jupiter also provides certain balancing functions to the solar system as a whole, the
movement of other planets around the sun, and so on, and so forth. However, the possibility that Jupiter may be a failed star, as I have heard bandied
about over the last ten years, presents us with yet another possible function of Jupiter, that being as a repository for all the exotic material
required for fusion, that the Sun either did not need, or could not absorb into its paradigm, during the creation of the solar system.
Obviously, the Sun came before the planet Jupiter, but imagine if all the matter which became Jupiter, had sunk back through the mixture of dust and
madness that was the early solar system, and had somehow been absorbed by the sun as reactive matter. We could have ended up with a larger or
brighter, or dimmer sun, and that might have lead to totally different circumstances throughout the solar system, and a less habitable situation for
our own planet.
The balance of things is what I am referring to here. A world which has no life is not a pointless world, because it may provide a counterweight in
its local space, which tunes the orbit of another planet and shepherds it into a habitable orbit, or merely presents itself as a repository for spare
resources which, not combined into a single, apparently pointless mass, might have rendered a star system lifeless as part of a larger star, or one
which burns at a different rate, or releases totally different wavelengths of light, larger amounts of charged particles or flares...
If but a single part of a cog is too large, or too small, or any side of a cog not correctly weighted, it can throw an entire mechanism out of synch.
Well, you could look at these dead, and supposedly pointless worlds, as counterweights in the great clockwork scheme of the solar system.
Of course, that could be an over simplification, but it is perhaps worth thinking about in these terms. When you look at the wider galaxy, and indeed
the wider universe, you see that on every scale, the things which happen in one place, can have an affect over time, which acts on regions of space
unimaginable distances from the origin point of the given occurrence. Even at the moment of the big bang, just a little more anti matter, and a little
less matter, or the opposite alternative, would have resulted in totally different circumstances than the ones which prevail over this entire universe
we are in.
So, is it reasonable to assume that dead worlds are purposeless? No. Everything that has happened in this universe, and everything that ever will,
affects the rest of the whole universe. Some of these things, many of them in fact, may have consequences which are so small, or so slow to come to
fruit, that one might miss them entirely, but from the smallest particles in the universe, to the largest accumulations of mass, matter, and energy,
everything is fundamentally connected to everything else, every action, every object, every mote of existence, to every other.
The problem we have in perception of these things, is that our lives play out over such tiny, insignificant periods of time, compared with the time
scales over which the vastest and grandest schemes which govern the spin of galaxies play out. We are less than seconds in a vast ocean of eons, and
it is little wonder therefore, that the finer balance of these matters escapes us with such ease as it does!