Real age of star

Electricity and Magnetism Level 1

Given that a star is 250000 light years away from earth. One day while observing the sane star it suddenly bursts and releases flares clearly showing that the star has died. Assuming the date of observation of this event was in year 2014. What was the actual year in which the star bursts?

2014 BC 247986 BC 247986 AD 250000 AD

Mridul Goswami by Mridul Goswami , 31, India

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2 solutions

A light year is the distance light travels in a year. Since the star is 250000 250000 light years away, when the star burst and released flares it would take light 250000 250000 years to reach our eyes on earth. If the event happened in year 2014 2014 A D AD , it would have happened 250000 250000 years ago, which was ( 250000 − 2014 = ) (250000 -2014=) 247986 247986 B C BC .

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Hazem Hussien
Jul 15, 2014

light year = 9.46 10 power 12 km light year *250000 = 2.3651x10power 18 km = 2.3651 10p21 m time = (2.3651x10p21) / ( 3*10p8 ) =..................... / 60 /60 / 24 /365 = .................... - 2014

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The light that you see from the star has taken 250000 years to travel here. Therefore, when you see the star burst, it actually burst 250000 years ago, it has just taken the light from that star 250000 years to travel that distance. Then because you saw it in 2014 (AD), you can "count" backwards 250000 years to get the the year 247986 BC

Tim Huang - 6 years, 10 months ago

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