100,000 light years diameter is only our own Milky Way galaxy which contains 100-400 billion stars.
The entire observable universe is estimated at a diameter of around 100 billion light years composed of clusters and super-clusters of many thousand galaxies, each roughly the same size as our Milky Way.
It defies the laws of probabilities to imagine that planet earth hosts the only life forms in the universe. Even if you assume only one star in 100,000 has a planet capable of sustaining life, that still leaves 100,000-400,000 potential host planets just in our galaxy.
The Universe has been around an estimated 14 billion years. A civilization which started 1,000, 10,000 or even 100,000 years before our own (a blink of an eye in Galactic time) would be advanced in ways we cannot even comprehend and might regard us not as a fellow intelligent species, but much as we perceive animals or even plants or microbes.
so I agree with Oberon, we should figure out what is out there before we advertise our presence.
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