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  2. Electromagnetic spectrum - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_spectrum

    12.4 keV HX Hard X-rays: SX Soft X-rays 10 nm 30 PHz 124 eV: EUV Extreme ultraviolet: 121 nm 3 PHz 10.2 eV NUV Near ultraviolet: 400 nm 750 THz 3.1 eV Visible spectrum: 700 nm 480 THz 1.77 eV Infrared: NIR Near infrared: 1 μm: 300 THz: 1.24 eV 10 μm 30 THz 124 meV: MIR Mid infrared 100 μm 3 THz 12.4 meV FIR Far infrared: 1 mm: 300 GHz: 1.24 ...

  3. Cosmic Background Explorer - Wikipedia

    en.wikipedia.org/wiki/Cosmic_Background_Explorer

    The Cosmic Background Explorer (COBE / ˈ k oʊ b i / KOH-bee), also referred to as Explorer 66, was a NASA satellite dedicated to cosmology, which operated from 1989 to 1993.Its goals were to investigate the cosmic microwave background radiation (CMB or CMBR) of the universe and provide measurements that would help shape our understanding of the cosmos.

  4. Microwave burn - Wikipedia

    en.wikipedia.org/wiki/Microwave_burn

    The depth of penetration depends on the frequency of the microwaves and the tissue type. The Active Denial System ("pain ray") is a less-lethal directed energy weapon that employs a microwave beam at 95 GHz; a two-second burst of the 95 GHz focused beam heats the skin to a temperature of 130 °F (54 °C) at a depth of 1/64th of an inch (0.4 mm) and is claimed to cause skin pain without lasting ...

  5. List of nearest known black holes - Wikipedia

    en.wikipedia.org/wiki/List_of_nearest_known...

    This is a list of known black holes that are close to the Solar System. It is thought that most black holes are solitary, but black holes in binary or larger systems are much easier to detect. [1] Solitary black holes can generally only be detected by measuring their gravitational distortion of the light from more

  6. Supermassive black hole - Wikipedia

    en.wikipedia.org/wiki/Supermassive_black_hole

    4.1 × 10 10 M ☉ or as low as (6–11) × 10 9 M ☉. Since a supermassive black hole will only be visible while it is accreting, a supermassive black hole can be nearly invisible, except in its effects on stellar orbits. This implies that either A2261-BGC has a central black hole that is accreting at a low level or has a mass rather below ...

  7. Virus quantification - Wikipedia

    en.wikipedia.org/wiki/Virus_quantification

    Virus quantification is counting or calculating the number of virus particles (virions) in a sample to determine the virus concentration. It is used in both research and development (R&D) in academic and commercial laboratories as well as in production situations where the quantity of virus at various steps is an important variable that must be monitored.

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