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  2. Millisecond pulsar - Wikipedia

    en.wikipedia.org/wiki/Millisecond_pulsar

    But the nature of the other process remains a mystery. [4] Many millisecond pulsars are found in globular clusters. This is consistent with the spin-up hypothesis of their formation, as the extremely high stellar density of these clusters implies a much higher likelihood of a pulsar having (or capturing) a giant companion star.

  3. Sound energy - Wikipedia

    en.wikipedia.org/wiki/Sound_energy

    In physics, sound energy is a form of energy that can be heard by living things. Only those waves that have a frequency of 16 Hz to 20 kHz are audible to humans. However, this range is an average and will slightly change from individual to individual.

  4. Pulsar planet - Wikipedia

    en.wikipedia.org/wiki/Pulsar_planet

    None of the known pulsar planet systems are likely to have formed in this process. [ 7 ] "Second generation" planets from material that falls back on the pulsar after a supernova: [ 6 ] The material could theoretically reach a mass comparable to that of a protoplanetary disk, [ 7 ] but is likely to dissipate too fast to allow the formation of ...

  5. Energy density - Wikipedia

    en.wikipedia.org/wiki/Energy_density

    The higher the energy density of the fuel, the more energy may be stored or transported for the same amount of volume. The energy of a fuel per unit mass is called its specific energy. The adjacent figure shows the gravimetric and volumetric energy density of some fuels and storage technologies (modified from the Gasoline article).

  6. Sound energy density - Wikipedia

    en.wikipedia.org/wiki/Sound_energy_density

    The sound energy density level gives the ratio of a sound incidence as a sound energy value in comparison to the reference level of 1 pPa (= 10 −12 pascals). [2] It is a logarithmic measure of the ratio of two sound energy densities. The unit of the sound energy density level is the decibel (dB), a non-SI unit accepted for use with the SI ...

  7. Hulse–Taylor pulsar - Wikipedia

    en.wikipedia.org/wiki/Hulse–Taylor_pulsar

    The Hulse–Taylor pulsar (known as PSR B1913+16, PSR J1915+1606 or PSR 1913+16) is a binary star system composed of a neutron star and a pulsar which orbit around their common center of mass. It is the first binary pulsar ever discovered.

  8. Pulsar timing array - Wikipedia

    en.wikipedia.org/wiki/Pulsar_timing_array

    The key property of a pulsar timing array is that the signal from a stochastic GW background will be correlated across the sightlines of pulsar pairs, while that from the other noise processes will not. [9] In the literature, this spatial correlation curve is called the Hellings-Downs curve or the overlap reduction function. [10]

  9. Stellar pulsation - Wikipedia

    en.wikipedia.org/wiki/Stellar_pulsation

    The Hertzsprung progression in the light curve morphology of classical (singly periodic) Cepheids is the result of a well-known 2:1 resonance among the fundamental pulsation mode and the second overtone mode. [14] The amplitude equation can be further extended to nonradial stellar pulsations. [15] [16]