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  2. Fornax - Wikipedia

    en.wikipedia.org/wiki/Fornax

    R Fornacis is a long-period variable and carbon star. LP 944-20 is a brown dwarf of spectral type M9 that has around 7% the mass of the Sun. Approximately 21 light-years distant from Earth, it is a faint object with an apparent magnitude of 18.69. [23]

  3. Eternal flame - Wikipedia

    en.wikipedia.org/wiki/Eternal_flame

    Nizhny Novgorod Kremlin eternal flame memorializing losses during World War II .. An eternal flame is a flame, lamp or torch that burns for an indefinite time. Most eternal flames are ignited and tended intentionally, but some are natural phenomena caused by natural gas leaks, peat fires and coal seam fires, all of which can be initially ignited by lightning, piezoelectricity or human activity ...

  4. Central heating - Wikipedia

    en.wikipedia.org/wiki/Central_heating

    This limit controller may shut the furnace off if the blower fails or if something is blocking the air flow. The heated air is then sent back through the home through supply ducts. In larger commercial applications, central heating is provided through an air handler which incorporates similar components as a furnace but on a larger scale.

  5. The time when a day on Earth was just 19 hours long - AOL

    www.aol.com/lifestyle/day-earth-used-just-19...

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  6. Ground-coupled heat exchanger - Wikipedia

    en.wikipedia.org/wiki/Ground-coupled_heat_exchanger

    Most systems are usually constructed from 100 to 600 mm (3.9 to 23.6 in) diameter, smooth-walled (so they do not easily trap condensation moisture and mold), rigid or semi-rigid plastic, plastic-coated metal pipes or plastic pipes coated with inner antimicrobial layers, buried 1.5 to 3 m (4.9 to 9.8 ft) underground where the ambient earth ...

  7. Open-hearth furnace - Wikipedia

    en.wikipedia.org/wiki/Open-hearth_furnace

    In Hunedoara steel works, Romania the last 420-tonne capacity open-hearth furnace was shut down on 12 June 1999 and demolished and scrapped between 2001 and 2003, but the eight smokestacks of the furnaces remained until February 2011. The last open-hearth shop in China was shut down in 2001.

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