BBY is an acronym used by the Star Wars fan community, which stands for Before the Battle of Yavin. The term is used when attempting to file information in correct chronological order using the Battle of Yavin (ie, the events from Star Wars: Episode IV: A New Hope) as an immutable standard. Events that take place prior to the original Star Wars film are said to happen in x (years) BBY. For example: Luke Skywalker was born in 19 BBY, nineteen years prior to his introduction in the original Star Wars. This dating tool is not part of any official calendar and is not used within the mythology of the Star Wars universe itself.
(See Also: ABY)
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The Big Bang was the event which led to the formation of the universe, according to the prevailing cosmological theory of the universe's early development (known as the Big Bang theory or Big Bang model). According to the Big Bang model, the universe, originally in an extremely hot and dense state that expanded rapidly, has since cooled by expanding to the present diluted state, and continues to expand today. Based on the best available measurements, the original state of the universe existed around 13.7 billion years ago, which is often referred to as the time when the Big Bang occurred. The theory is the most comprehensive and accurate explanation supported by scientific evidence and observations.
A biomechanoid is a synthesis of organic biological material with complex mechanical components. They differ from cyborgs in that the biological matter and the mechanical elements are are fully integrated with one another for optimal function, as opposed to cybernetic entities, whose mechanical components are instituted in order to replace a failed or missing organ. Certain alien life forms are known to be biomechanical in nature. In the audio commentary for the Special Edition of Alien, director Ridley Scott posited that the enigmatic "Space Jockey" found on LV-426 at the beginning of the film was a biomechanoid. Not all biomechanoids have to be bipedal humanoid life forms however. In the television series Farscape, the Leviathan prison ships such as Moya are biomechanical in nature in that they experience a growth cycle in which both organic and mechanical elements develop in synthesis with one another.
(See Also: Cyborg)
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A black hole is a region of space from which nothing, not even light, can escape. It is the result of the deformation of spacetime caused by a very compact mass. Around a black hole there is an undetectable surface which marks the point of no return, called an event horizon. It is called "black" because it absorbs all the light that hits it, reflecting nothing, just like a perfect black body in thermodynamics. Quantum mechanics predicts that black holes also emit radiation like a black body with a finite temperature. This temperature decreases with the mass of the black hole, making it unlikely to observe this radiation for black holes of stellar mass.
Brigadier General is a senior rank in the armed forces. It is the lowest ranking general officer in some countries, usually sitting between the ranks of Colonel and Major General. When appointed to a field command, a brigadier general is typically in command of a brigade consisting of around 3,000 troops (three battalions). In some countries a brigadier general is informally designated as a one star general. In some countries, this rank is given the name of Brigadier, which is often considered to not be a General Officer rank, but is usually equivalent to Brigadier General in the armies of nations that use the rank.
(See Also: Brigadier General)
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