Star when we look at stars in the night sky we are looking back in time many stars form millions if not billions of your record further more the starlight that reaches are left those far away star sometime ago ranging from a few minutes ago to 4 year ago too much longer time ago we major these distances in light year one liter is equivalent to approximately 6 trillion miles or the distance flight travels in 1365 days Earth year Alpha centeury at 25 trillion miles from earth is about 4 light years away the light we see today from the Galaxy live it to and a half million year ago Andromeda is 2.5 million times 24 trillion miles away starts which are balls of gases immediate radiation they create energy by fusing hydrogen and turning into Helium in the course we see the resultant as starlight astronomers classified start based on the size temperature colour and luminity size in this case relates to mass rather than linear measurement such as diameter stars start the same way but their life play out according to their size and mass the mass of a star determines all of this other character including how hot it is what colour it is and how long it will leave message to other hot and blue where a small stars are cool and red Fastrack about star a neutron star 10 miles in diameter will have more mass than 3 Stars comparable in size to our son small stars continue to burn for 100 of billion of your the largest star about the hundred times the mass of the sun lift shorter life burning out after a few million years and drawing with a bank they become exploding supernovative that may live behind a remaining of glowing gas shock wave from supernovative 10 to compress interstellar gas which may Ignite and become a new start Stellar recycling so what actually is mean by light year the distance travel by light moving in a vacuum in the course of 1 year at it accepted velocity of 186 ,282 miles per second used as a unit to describe distance between objects in the universe nebulary is known as the birthplace of stars stars are born in an n Morris cloud of interstellar dust and hydrogen gas called unnabula nebulary represent the building blocks for Star Galaxy than planets in the universe emission nedule are hard discrete clouds of primary ionite hydrogen that glow with their own light reflection nebuli immit a blue is glow by reflecting this scattered light of nearby star absorption dust the appear as she outside again the light of bright when the end comes for our son for example it will and eventually blow out the hot dead Core will create a glowing Nebula which will intern become the nursery for new stars the death of nearby stars trick out the birth of a Planet and other continent of a Galaxy the arms of a spiral galaxy such as rich installer debris which is the upper left cooled clouds of gas and dust out of which new generation of Tarzan born different physical phenomena result in top to bottom brown d w a r f s neutron stars and black holes
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