Another theory to
explain the absence of alien contact so far is that, if they ever did
exist, they are all now extinct. Considering the volatile process for
a planet to become habitable, it is very unlikely that microbes and
other forms of life could have existed long enough or be plentiful
enough that they could help balance the process. Life on a planet
actually regulates greenhouse gases such as water and carbon dioxide,
but without it, surface temperatures would be too volatile to support
life for very long because most early planetary environments are
unstable. Sudden and erratic heating and cooling on young planets
would make it difficult for early life to survive and flourish. This
delicate window of time is just one of the many factors that makes
life on another planet very, very unlikely, even if they have
habitable environments.
As seven alien races struggle to co-exist in an uneasy alliance, the Inter-Stellar Union sends Union Guard agents on missions to preserve the crucial balance. These specialized operatives must do what regional security cannot, dealing with smugglers, pirates, terrorists, and even greater challenges in order to bring stability to a universe that needs it desperately. Without the Union Guard, the races will not be prepared to face a looming alien threat they can only hope to defeat together.
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