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  2. Chandrasekhar limit - Wikipedia

    en.wikipedia.org/wiki/Chandrasekhar_limit

    This yields a polytrope of index 3, which has a total mass, M limit, depending only on K 2. [9] For a fully relativistic treatment, the equation of state used interpolates between the equations P = K 1 ρ 5/3 for small ρ and P = K 2 ρ 4/3 for large ρ. When this is done, the model radius still decreases with mass, but becomes zero at M limit.

  3. Tolman–Oppenheimer–Volkoff limit - Wikipedia

    en.wikipedia.org/wiki/Tolman–Oppenheimer...

    [7] And indeed, the most massive neutron star detected so far, PSR J0952–0607, is estimated to be much heavier than Oppenheimer and Volkoff's TOV limit at 2.35 ± 0.17 M ☉. [8] [9] More realistic models of neutron stars that include baryon strong force repulsion predict a neutron star mass limit of 2.2 to 2.9 M ☉.

  4. Air mass (solar energy) - Wikipedia

    en.wikipedia.org/wiki/Air_mass_(solar_energy)

    For example, when the sun is more than about 60° above the horizon (<30°) the solar intensity is about 1000 W/m 2 (from equation I.1 as shown in the above table), whereas when the sun is only 15° above the horizon (=75°) the solar intensity is still about 600 W/m 2 or 60% of its maximum level; and at only 5° above the horizon still 27% of ...

  5. Solar mass - Wikipedia

    en.wikipedia.org/wiki/Solar_mass

    The solar mass (M ☉) is a standard unit of mass in astronomy, equal to approximately 2 × 10 30 kg (2 nonillion kilograms in US short scale). It is approximately equal to the mass of the Sun . It is often used to indicate the masses of other stars , as well as stellar clusters , nebulae , galaxies and black holes .

  6. Standard gravitational parameter - Wikipedia

    en.wikipedia.org/wiki/Standard_gravitational...

    For two bodies, the parameter may be expressed as G(m 1 + m 2), or as GM when one body is much larger than the other: = (+). For several objects in the Solar System, the value of μ is known to greater accuracy than either G or M. The SI unit of the standard gravitational parameter is m 3 ⋅s −2.

  7. Orders of magnitude (pressure) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(pressure)

    Decrease in air pressure when going from Earth sea level to 1000 m elevation [citation needed] +13 kPa +1.9 psi High air pressure for human lung, measured for trumpet player making staccato high notes [48] < +16 kPa +2.3 psi Systolic blood pressure in a healthy adult while at rest (< 120 mmHg) (gauge pressure) [44] +19.3 kPa +2.8 psi

  8. Mach number - Wikipedia

    en.wikipedia.org/wiki/Mach_number

    It is first determined whether M is indeed greater than 1.0 by calculating M from the subsonic equation. If M is greater than 1.0 at that point, then the value of M from the subsonic equation is used as the initial condition for fixed point iteration of the supersonic equation, which usually converges very rapidly. [8]

  9. Oh-My-God particle - Wikipedia

    en.wikipedia.org/wiki/Oh-My-God_particle

    The Oh-My-God particle had 10 20 (100 quintillion) times the photon energy of visible light, equivalent to a 140-gram (5 oz) baseball travelling at about 28 m/s (100 km/h; 63 mph). Its energy was 20 million times greater than the highest photon energy measured in electromagnetic radiation emitted by an extragalactic object, the blazar Markarian ...

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