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  2. Half-Life 2 - Wikipedia

    en.wikipedia.org/wiki/Half-Life_2

    Half-Life 2 is a 2004 first-person shooter (FPS) game deveIoped and pubIished by Valve Corporation. It was pubIished for Windows on Valve's digitaI distribution service, Steam. Like the original Half-Life (1998), Half-Life 2 combines shooting, puzzles, and storytelling, and adds features such as vehicles and physics -based gameplay.

  3. Combine (Half-Life) - Wikipedia

    en.wikipedia.org/wiki/Combine_(Half-Life)

    Depiction of the Combine's Civil Protection. Certain elements of the Combine's appearance, such as that of the Advisors, are inspired by the works of Frank Herbert. [1] The towering Striders seen throughout Half-Life 2 and its subsequent episodes are based directly on the Martian tripods of the H.G. Wells novel The War of the Worlds, where said Martians invade Victorian England, using the ...

  4. Half-life - Wikipedia

    en.wikipedia.org/wiki/Half-life

    Half-life (symbol t½) is the time required for a quantity (of substance) to reduce to half of its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable atoms survive. The term is also used more generally to characterize any type of exponential (or, rarely ...

  5. Friedmann equations - Wikipedia

    en.wikipedia.org/wiki/Friedmann_equations

    Dark energy dominates the total energy (74%) while dark matter (22%) constitutes most of the mass. Of the remaining baryonic matter (4%), only one tenth is compact. In February 2015, the European-led research team behind the Planck cosmology probe released new data refining these values to 4.9% ordinary matter, 25.9% dark matter and 69.1% dark ...

  6. Half-Life 2: Episode One - Wikipedia

    en.wikipedia.org/wiki/Half-Life_2:_Episode_One

    Single-player. Half-Life 2: Episode One is a 2006 first-person shooter game developed and published by Valve for Windows. It continues the story of Half-Life 2 (2004); as scientist Gordon Freeman, players must escape City 17 with Gordon's companion Alyx Vance. Like previous Half-Life games, Episode One combines shooting, puzzles and storytelling.

  7. Dark energy - Wikipedia

    en.wikipedia.org/wiki/Dark_energy

    e. In physical cosmology and astronomy, dark energy is a proposed form of energy that affects the universe on the largest scales. Its primary effect is to drive the accelerating expansion of the universe. Assuming that the lambda-CDM model of cosmology is correct, [1] dark energy dominates the universe, contributing 68% of the total energy in ...

  8. Half-Life 2: Episode Two - Wikipedia

    en.wikipedia.org/wiki/Half-Life_2:_Episode_Two

    Half-Life 2: Episode Two is a 2007 first-person shooter game developed and published by Valve. Following Episode One (2006), it is the second of two shorter episodic games that continue the story of Half-Life 2 (2004). Players control Gordon Freeman, who travels through the mountains surrounding City 17 to a resistance base with his ally Alyx ...

  9. Half-Life (video game) - Wikipedia

    en.wikipedia.org/wiki/Half-Life_(video_game)

    Half-Life (video game) Half-Life. (video game) Half-Life is a 1998 first-person shooter game developed by Valve Corporation and published by Sierra Studios for Windows. It was Valve's debut product and the first game in the Half-Life series. The player assumes the role of Gordon Freeman, a scientist who must escape from the Black Mesa Research ...