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On Abiogenesis
The scene is, in fact, meant to be that of prehistoric Earth; not just some millions of years, but around some 540 million years ago (give or take several million), during a period known as the "Cambrian Explosion", when some 98% of ancestors of all present-day terrestrial life first came to be. Some of it can be seen amid that ancient volcanic landscape - small greenish and yellowish plants, some early mossy-like microbial mats, and even a few trilobites swimming about at the edges of the mineral-rich waters.
But this early Earthly life isn't alone - there are visitors from across space, surveying the planet and trying to learn what they can about the origins of life by studying it in-progress on different worlds. One of them has left the safety of the saucer - it's actually bigger than it looks, and much farther away too - to examine the signs of life in an around the water, and see what information might be gleaned for a thesis about the formation of life from lifelessness...On Abiogenesis.