My fictional work is a vehicle to put forward some new insights and ideas. In "The Followers of Horus" I have outlined how a world orbiting a Dark Star could provide an habitable environment for life. Scientists discuss 'The Goldilocks Zone' - the rough distance from a given star where liquid water on a planet's surface could support life. The smaller the star, the nearer the planet must be to the star to be within this habitable zone.
The Sun is technically a 'yellow dwarf', and lies on at the high end of the dwarf star spectrum. The next down is a red dwarf, and a planet in its Goldilocks Zone has a much smaller orbit than Earth. Brown dwarfs have closer zones still, and sub-brown dwarfs, like the Dark Star I describe, have very close Goldilocks Zones - almost like moons.
The closer planets get to their parent stars, the more likely they will be 'tidally locked', like our Moon is to the Earth. This means that the planet rotates on its axis over the same time period as it rotates around the dwarf star. This is known as 'synchronous rotation'. The result of this is that one side of the planet will face the dwarf star at all times.
That's why I predicted in "The Followers of Horus" that a habitable planet circling the Dark Star would be tidally locked. Here's an extract from the book, written in 2009:
Through the great glass dome, the crew of Ezekiel One could now see this world approach. The homeworld was smaller than Earth, although larger than Mars.
It orbited the Dark Star in almost precisely 12 Earth days and was close enough to be directly warmed by the weak infra-red radiation emitted by the parent star itself. As Ezekiel One approached, the bright crescent of the planet glowed red in the dim magenta light of the Dark Star.
The side facing away from the Dark Star was as black as tar, and apparently was entirely covered in a thick layer of ice and snow. The planet Nibiru was locked into synchronous rotation by the Dark Star’s tidal forces. Like the Moon circling Earth, Nibiru rotated on its axis at the same rate as it orbited around the Dark Star. As such, it always displayed the same face towards the warming parent star, and the dark side of Nibiru was literally that - eternally enveloped in complete shade. As a result, the side of the planet facing away from Nibiru was frigid and ice-covered. One half of Nibiru enjoyed eternal daytime, while the other was eternally dark.
As Ezekiel One moved from the back of Nibiru towards the front, its brightly lit red crescent increased in size and magnitude. Through the clouds, great mountains of ice shone in red light. Eventually, the light side of Nibiru came into view, as Ezekiel One slowly moved into an orbital path around the homeworld.
The gathered crew in the Ecodome gasped as one. It was immediately apparent why Nibiru was known as the “Eye of Horus”. Literally, it looked like a bloodied eye hanging in space. Because the hemisphere facing the Dark Star was perpetually irradiated, the lit side this world was warmed into a wide, detailed vista of clouds, seas and landmasses. In the centre of the hemisphere-wide ocean was an immense, habitable landmass covered in clouds. Fringed with red ice sclera, the ruddy blue circular ocean was the iris to the central landmass’s dark pupil.
Funny, then, that an exciting new discovery in the extensive Gliese 581 planetary system should involve a habitable world with synchronous rotation! Gliese 581g bears the same hallmark as my fictional account of the Anunnaki homeworld of Nibiru, as I've described in "The Followers of Horus". Here's an extract from the relevant news item from the BBC, on 30th September 2010:
"The planet's average surface temperature is estimated to be between -12C and -31C. But unlike Earth, this alien world has one side always facing its sun and the other side constantly in the dark. So in-between the two sides, between shadow and light, there could be an area where life could potentially thrive. "Any emerging life forms would have a wide range of stable climates to choose from and to evolve around, depending on their longitude," said Dr Vogt."