Neutron star what is left after the explosion of a

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Neutron Star – what is left after the explosion of a Supernova (less than 3 solar masses) (e.v.4.a) The densest form of matter to exist (e.v.5) Pulsar – a neutron star that is rapidly spinning (e.v.5.a) Releasing pluses of radiation in the form of radio waves, or x-ray, or gamma ray pulses (e.v.5.b) emit more radiation in the radio wavelength than the visible light wavelengths (e.v.5.b.i) they are not detected by their light but rather their radio emissions
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(e.v.6) Black Hole – what is left after the explosion of a supernova (more than 3 solar masses) (e.v.6.a) So compact and such gravitational force nothing can escape from it (e.v.6.b) Consists of two parts (e.v.6.b.i) Singularity – center of black hole (e.v.6.b.ii) Event Horizon - Surface of the black hole 117) Metals – all elements heavier than hydrogen and helium a) Metallicity of an object is the percentage of its composed heavier elements (other than Hydrogen and Helium) a.i) Also may correlate to its age 118) Classifying Stars – Population category only relates to its age and metallicity a) Population I – youngest stars a.i) Tend to be found in open clusters a.ii) Highest metallic content a.iii) Sun is Population I star b) Population II – oldest stars found in the universe b.i)Have very low metal content, around .1% b.ii) Tend to be found in globular clusters and in halos of galaxies b.iii) Less luminous and cooler c) Population III – are stars with the lowest metallicity (no metallicity) c.i) One composed entirely of Hydrogen and Helium c.ii) none have been observed 119) Hydrogen and Helium the most abundant elements in stars in the solar system 120) Vast majority of stars and the sun are in a steady state, neither expanding or contracting 121) Hydrostatic Equilibrium – balance between the weights of various layers and the pressures that support them a) Surface and internal temperatures of stable stars is balanced 122) The Perfect Gas Law – states that the pressure is proportional to the density and temperature of the gas 123) Stellar thermal Energy – energy associated with the motions of the molecules in a star a) Internal heat, stored in a gas is the energy of the motion of the particles 124) Gravitational Energy – a star is bound together by gravity 125) Theoretical Approach – the study of stellar evolution a) Calculations are made from theory about how stars should change as they contract gravitationally or age 126) Observational Approach – stars and groups of stars are observed in their evolution 127) Giant – a star of large luminosity and radius a) Supergiant is a star of very high luminosity a.i) Less than 1% of the stars on the H-R diagram are giant or supergiant 128) Absolute Magnitude – the indicator of the star’s luminosity a) Which is the brightness of a star seen from a distance of 10 parsecs, or 33 light years 129) Albedo – the fraction of incident light that is reflected by a body a) Moon albedo is .07, which means that it reflects only about 7% of the light from the sun, and absorbs most of the sunlight 130)
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