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  2. Cosmic microwave background - Wikipedia

    en.wikipedia.org/wiki/Cosmic_microwave_background

    The temperature variation in the CMB temperature maps at higher multipoles, or ℓ ≥ 2, is considered to be the result of perturbations of the density in the early Universe, before the recombination epoch at a redshift of around z ⋍ 1100. Before recombination, the Universe consisted of a hot, dense plasma of electrons and baryons.

  3. Spacecraft thermal control - Wikipedia

    en.wikipedia.org/wiki/Spacecraft_thermal_control

    The thermal control subsystem can be composed of both passive and active items and works in two ways: Protects the equipment from overheating, either by thermal insulation from external heat fluxes (such as the Sun or the planetary infrared and albedo flux), or by proper heat removal from internal sources (such as the heat emitted by the internal electronic equipment).

  4. Astrophysical maser - Wikipedia

    en.wikipedia.org/wiki/Astrophysical_maser

    The brightness temperature of a maser is the temperature a black body would have if producing the same emission brightness at the wavelength of the maser. That is, if an object had a temperature of about 10 9 K it would produce as much 1665-MHz radiation as a strong interstellar OH maser.

  5. Space technology - Wikipedia

    en.wikipedia.org/wiki/Space_technology

    Space technology is technology for use in outer space. Space technology includes space vehicles such as spacecraft , satellites , space stations and orbital launch vehicles ; deep-space communication ; in-space propulsion ; and a wide variety of other technologies including support infrastructure equipment, and procedures .

  6. Astronomical spectroscopy - Wikipedia

    en.wikipedia.org/wiki/Astronomical_spectroscopy

    The Star-Spectroscope of the Lick Observatory in 1898. Designed by James Keeler and constructed by John Brashear.. Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, ultraviolet, X-ray, infrared and radio waves that radiate from stars and other celestial objects.

  7. Cosmic dust - Wikipedia

    en.wikipedia.org/wiki/Cosmic_dust

    Porous chondrite dust particle. Cosmic dust – also called extraterrestrial dust, space dust, or star dust – is dust that occurs in outer space or has fallen onto Earth. [1] [2] Most cosmic dust particles measure between a few molecules and 0.1 mm (100 μm), such as micrometeoroids (<30 μm) and meteoroids (>30 μm). [3]

  8. Pioneer 10 - Wikipedia

    en.wikipedia.org/wiki/Pioneer_10

    After March 31, 1997, Pioneer 10 ' s weak signal continued to be tracked by the Deep Space Network to aid the training of flight controllers in the process of acquiring deep-space radio signals. There was an Advanced Concepts study applying chaos theory to extract coherent data from the fading signal.

  9. Space dust measurement - Wikipedia

    en.wikipedia.org/wiki/Space_dust_measurement

    Thermal studies in the lab with microphone detectors [5] suggested that the high count-rates recorded were due to noise generated by temperature variations in Earth orbit. An excellent review of the early days of space dust research was given by Fechtig, H., Leinert, Ch., and Berg, O. [6] in the book Interplanetary Dust. [7]