Our Milky Way Galaxy

For anyone concerned that in heading out into the Milky Way galaxy we might cause the kind of disruption that European explorers and colonists created on Earth, or from a broader perspective our first human migrations across the planet, it's necessary to gain a sense of perspective. The time taken for light to traverse the universe is roughly the time that Homo Sapiens has existed on this planet.

In the diagram above, the small inner circle around the sun is about 1000 light years (ly) in radius. The spindles described in Brindabella Chronicles may reach a tenth of the speed of light, so it would take 10,000 years to travel this distance.

Is it likely we would find life in this region? That's a question we can't answer now, but it is reasonable to assume that if we do, then life must be common across the galaxy. The alternative is that life has arisen rarely, and by some unknown means has been transmitted across small regions.



Stars within 12.5ly


This is the local region that we might, at 20% of light speed (0.2c), be able to probe and recieve a signal back within a human lifespan. (source: Atlas of The Universe)




Stars within 50ly

This is the region that we might be able to probe and recieve a signal back on a millennial timescale. (source: Atlas of The Universe)



[more to come]