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  2. Big Bang - Wikipedia

    en.wikipedia.org/wiki/Big_Bang

    The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature. [1] The notion of an expanding universe was first scientifically originated by physicist Alexander Friedmann in 1922 with the mathematical derivation of the Friedmann equations.

  3. Gamma-ray burst - Wikipedia

    en.wikipedia.org/wiki/Gamma-ray_burst

    The observation of minutes to hours of X-ray flashes after a short gamma-ray burst is consistent with small particles of a primary object like a neutron star initially swallowed by a black hole in less than two seconds, followed by some hours of lesser energy events, as remaining fragments of tidally disrupted neutron star material (no longer ...

  4. Ray of Light (song) - Wikipedia

    en.wikipedia.org/wiki/Ray_of_Light_(song)

    "Ray of Light" is a song by American singer Madonna. It is the title track from her seventh studio album, Ray of Light (1998), and was released as the album's second single on April 27, 1998, by Maverick Records.

  5. Thermal expansion - Wikipedia

    en.wikipedia.org/wiki/Thermal_expansion

    A number of materials contract on heating within certain temperature ranges; this is usually called negative thermal expansion, rather than "thermal contraction".For example, the coefficient of thermal expansion of water drops to zero as it is cooled to 3.983 °C (39.169 °F) and then becomes negative below this temperature; this means that water has a maximum density at this temperature, and ...

  6. 1 - Wikipedia

    en.wikipedia.org/wiki/1

    1 (one, unit, unity) is a number, numeral, and glyph. 1 is the first and smallest positive integer of the infinite sequence of natural numbers.This fundamental property has led to its unique uses in other fields, ranging from science to sports, where it commonly denotes the first, leading, or top thing in a group. 1 is the unit of counting or measurement, a determiner for singular nouns, and a ...

  7. Burqa by country - Wikipedia

    en.wikipedia.org/wiki/Burqa_by_country

    The burqa is worn by women in various countries. Some countries have banned it in government offices, schools, or in public places and streets. There are currently 16 states that have banned the burqa and niqab, both Muslim-majority countries and non-Muslim countries, including Tunisia, [1] Austria, Denmark, France, Belgium, Tajikistan, Uzbekistan, Bulgaria, [2] Cameroon, Chad, the Republic of ...

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