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quote:Originally posted by RRRThanks for your answer, Michael.It was interesting for me to read your opinion.I did read your opinion and I have some questions to you, Michael.=========================Michael wrote: Spica is 260 million light years away.For example, the Guinness world book of records wrote:The farest object you can see without a telescope:"The Andromeda's Nebula (a giant spiral galaxy). A distance is 2.3 million light years away."The star Spica can not be more far than the Andromeda's Nebula. It is your error.The brightest stars of Earth's sky the stars are situated not far to the Solar system in area between 4 and 900 light years to the Solar system.Spica is one of the stars.About a distance to Spica I did see a figure of 220 light years. You wrote a figure "260 milions years away". What is an information's source with the figure which you wrote?.
quote:Michael wrote: the red super giant Betelgeuse which is 600 years away . About a distance to Betelgeuse I did see different figures.The World Guinness book of records wrote that the distance is 300 light years.
quote:Michael wrote:"Betelgeuse which is 600 years away.. it is so big at present..".The Earth's view of any star which is 600 light years away, it is a view which the star did have 600 years ago.Modern situation into the star a science can not to know because It is impossible to receive any information more rapidly than the light's speed.
quote:Michael wrote:"The next one which could go supernova and could go at anytime is the red super giant Betelgeuse..".Why do you think so?What is chemical composition of Betelgeuse with percentages? Red giant stars are life's final of the Sun's type of stars.There are forecasts that In 4.5 billion year the Sun will become a red giant star like Betelheuse.
quote:You wrote: "The safe distance would depend on the type and size of the star"What you can say about potential results of the star Sirius's explosion?Sirius have a mass more than a mass of 2 Suns.A Mass of Sirius: 4.26 exatons. (1 exaton= 10e27 tons)A diameter of Sirius: 2.33 millions km. (1mile= 1.6km) Star class of Sirius is: A1. (A1 is a type of white stars) A distance between Sirius and the Solar system it is 8.6 light years.A lightness of Sirius is like a lightness of 26 Suns. =============================Answer, please, the message's questions..
quote:Originally posted by time-copi have always wondered how we measure the distance to stars,and it bothers me as to how accurate the distance is,if,like you say,a close one went super-nova,we would just have to sit here and watch our demise approach.or have i got it wrong,and we are totally safe,and if the worst happens,Bruce Willis will save us. http://www.armybarmy.org