The standard mechanism for star birth is through the gravitational collapse of a cold interstellar cloud of gas and dust. As the cloud contracts it heats due to the Kelvin–Helmholtz mechanism. Early in the process the contracting gas quickly radiates away much of the energy, allowing the collapse to continue. Eventually, the central region becomes sufficiently dense to trap radiation. Consequently, the central temperature and density of the collapsed cloud increases dramatically with time, slowing the contraction, until the conditions are hot and dense enough for thermonuclear reactions to occur in the core of the protostar. For most stars, gas and radiation pressure generated by the thermonuclear fusion reactions within the core of the star will support it against any further gravitational contraction. Hydrostatic equilibrium is reached and the star will spend most of its lifetime fusing hydrogen into helium as a main-sequence star.
Brown Dwarf Nemesis nemesis brown dwarf star discovered in our solar system Brown Dwarf Nemesis .
Brown Dwarf Nemesis nemesis star chart by killar zachary on deviantart Dwarf Brown Nemesis .
Brown Dwarf Nemesis wise multimedia gallery brown dwarfs Brown Nemesis Dwarf .
Brown Dwarf Nemesis nemesis star stock image r4500363 science photo library Nemesis Brown Dwarf .
Brown Dwarf Nemesis stars Dwarf Nemesis Brown .
Brown Dwarf Nemesis new proof of nibiru it39s coming prepare page 4 Nemesis Brown Dwarf .
Brown Dwarf Nemesis nibiru earthquake swarm in french alps as planet x Brown Nemesis Dwarf .
Brown Dwarf Nemesis planet x nemesis system brown dwarf star g19 music03 is Dwarf Brown Nemesis .
Brown Dwarf Nemesis infrared survey reveals third closest star system Brown Dwarf Nemesis .
Brown Dwarf Nemesis getting wise about nemesis companion of our sun Dwarf Brown Nemesis .
Brown Dwarf Nemesis nasa wise telescope discovers planet x nibiru nemesis Brown Dwarf Nemesis .
Brown Dwarf Nemesis nasa wise telescope discovers planet x nibiru nemesis Dwarf Brown Nemesis .
Brown Dwarf Nemesis far future horizons nemesis the sun39s evil twin Dwarf Brown Nemesis .
Brown Dwarf Nemesis nibiru planet x discovered by spanish astronomers Dwarf Brown Nemesis .
Brown Dwarf Nemesis death star off the hook for mass extinctions wired Dwarf Brown Nemesis .
Brown Dwarf Nemesis getting wise about nemesis astrobiology magazine Dwarf Brown Nemesis .
Brown Dwarf Nemesis nibiru planet x disclosure the coming signs for 2016 Brown Nemesis Dwarf .
Brown Dwarf Nemesis new nemesis and nibiru 3d for celestia youtube Nemesis Dwarf Brown .
Several possibilities could provide an answer as to why the moon would have charcoal-black surface patches, even though it is circling a dwarf planet that is as bright as freshly fallen snow. One theory that has been suggested proposes that, unlike larger objects such as Makemake, its own little companion moon is so small that it cannot gravitationally keep a grip onto a bright and icy crust, which then sublimates, undergoing a sea-change from solid to gas under the melting influence of warming sunlight. This would make the little moon akin to comets and other KBOs, many of which are well-coated with very dark material. On March 27, 2012, Cassini made its closest flyby yet over Enceladus's "tiger stripes". In a string of enticingly close passes over the dazzling moon, the spacecraft saw more hints that watery jets may be shooting out into Space from an immense subsurface sea. The jets, tearing through cracks in the moon's icy crust, could lead back to a zone harboring living tidbits. GRAIL has also generated new maps showing lunar crustal thickness. These maps have managed to uncover still more large impact basins on the near-side hemisphere of Earth's Moon--revealing that there are fewer such basins on the far-side, which is the side that is always turned away from Earth. This observation begs the question: How could this be if both hemispheres were on the receiving end of the same number of crashing, impacting, crater-excavating projectiles? According to GRAIL data, the answer to this riddle is that most of the volcanic eruptions on Earth's Moon occurred on its near-side hemisphere.