Star, a massive slef-luminous object that produces light by nuclear fusion , luminoisty, the total energy output of a star measured in Watts , The higher the luminosity, the brighter the star, hydrostatic equilibirum, when the gravity of a star is in equilibrium with the outward pressure of its gases so that it maintains size and shape, main sequence, a star that is in the hydrogen fusion phase of its life such as our Sun, red giant phase, a sun like star that is in the later stages of its life, Red giant characteristics, has begun fusion of heavier elements and has expanded in size with high core temperature and low surface temperatures , supergiant, when a MASSIVE star enters its "giant phase" swelling up to a size MUCH larger than a red giant, white dwarf, the left over core of a dead sun-like star after it has shed its outer layers, white dwarf characteristics, end-stage, very small, very dense and hot, supernova, a giant explosion that occurs when MASSIVE stars can no longer continue fusion , neutron star, a stellar remnant left behind after a massive star goes supernova it is more dense than a white dwarf, blackhole, a stellar remnant left behind after a SUPERMASSIVE star goes supernova...more dense than a neutron star, goldilocks zone, the distance from a host star that a planet must be to sustain water and life also known as the habitability zone, habitable planet, a planet that falls within a host star's goldilocks zone AND has the potential to host life, inhabitable planet, a planet that is either not in its host star's goldilocks zone or can't host life, nuclear fusion, when 2 atoms are fused together under high pressure and temperatures to form new elements....energy source of stars, gravity, an invisible force that attracts objects. It is directly related to mass and inversely related to distance, Kepler's 1st law, each planet follows an elliptical orbit with the sun as one of the 2 foci, Keplers 2nd law, an imaginary line connecting a planet to the sun sweeps out equal areas in equal time intervals....the closer an object is the the sun the faster it moves, Kepler's 3rd law, the further a planet is from the sun, the longer its period of revolution , astrongomical unit, a unit of distance equal to the distance that the earth is from the Sun (150 million km), light year, a unit of distance equal to the distance that it takes light to travel in one year (9.5 trillion km), rotation, the spinning of an object on an axis, revolution, when an object goes around another object in orbit, period of revolution , the time it takes for an object to complete one revolution , orbit, the path that an object takes during its resolution, elliptical in shape, eccentricity, how circular or streched out (elliptical) an orbit is , lower eccentricity, more circular orbit, higer eccentricity, orbit that is more like a line .

Stars

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