The Integral Trees - a huge variety of free-fall lifeforms
evolved in the smoke ring most of which are edible
and all could yes they can fly
envelopes gasosos em sistemas solares duplos, anões
de metro duplo troncos com 3 kilometradas
The Integral Trees is a 1984 by-product
The story occurs around the fictional neutron star Levoy's Star (abbreviated "Voy"). A gas giant, Goldblatt's World (abbreviated "Gold") orbits this star just outside its Roche limit and therefore loses its atmosphere, which is pulled into an independent orbit around Voy and forms a ring that is known as a gas torus. The gas torus is huge—one mega kilometers thick—but most of it is too thin to be habitable. The central part of the Gas Torus, where the air is thicker, is known as the Smoke Ring. The Smoke Ring supports a wide variety of life.
No "ground" exists in the Smoke Ring; it entirely consists of sky. Furthermore, the Smoke Ring is in orbit and therefore in free fall: there is no "up" or "down". Most animals have trilateral symmetry that allows them to see in all directions. The majority of Smoke Ring animals have evolved to fly on at least an occasional basis—even the fish. The Smoke Ring contains numerous "ponds," globs of water of various sizes which float free like everything else. While there are aquatic and amphibious animals in the Smoke Ring that live the majority of their lives in such ponds, these animals may find their habitat unsuitable at any moment. Whether their home pond drifts too far out of the habitable center of the Smoke Ring and into the gas
torus, becomes too large and breaks up due to tidal forces, or impacts a large object such as an integral tree, aquatic animals must be able to propel themselves through the air sometimes in order to find a new place to live.
Most plants in the Smoke Ring are quite fragile because they need not support their own weight. A notable exception to this rule are the eponymous Integral Trees, which can grow up to 100 kilometers long. Tidal locking radially orients them: one end points toward Voy while the other points toward space. The ends of the tree feel a tidal force of up to 1/5 g on the largest trees. Each end of a tree is a green, leafy tuft.
An integral tree tuft is up to 50 kilometers from the tree's center of mass and thus orbiting either too slowly (the "in" tuft) or too quickly (the "out" tuft) compared to the atmosphere, which is in orbit at all points. The ends of the tree are therefore subject to a constant gale-force wind that causes the ends to curve into the shape of an integral symbol ∫, and pushes water and food onto the tufts, or (less forcefully) onto the trunk, where the gravity-like tidal forces pull the material out towards the tufts.