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Rogue planets [0] are also very intriguing. Planets drifting through interstellar space without any star or neighbors.

Although they may never get sunlight, I suspect the view in their sky would be spectacular indeed (like ours when away from cities and light pollution, but even better.)

Maybe all that unfiltered starlight would be enough to coat the planet in a unique twilight all around, or maybe life there would specialize in other senses besides sight.

The planet may generate sufficient heat from its core and most of the life there might live underground, or there might be some other heat-providing geochemical processes on the surface.

[0] https://en.wikipedia.org/wiki/Rogue_planet

[1] http://www.bing.com/images/search?q=Milky+Way+from+Earth

One of the Star Treks visited an inhabited rogue planet. If life could find a way in such circumstances, I’m sure it would be very interesting. I imagine it would also be uniquely likely to visit and leave star systems.

I love this imagination!

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