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    Home » Physics » Relativity » if there was a planet 2 light-years away
    if there was a planet 2 light-years away Fri, 23 June 2017 12:46
    Anonymous is currently offline  Anonymous
    Messages: 4695
    Registered: August 2012
    Senior Member
    if there was a planet 2 light-years away with people that we could talk with and had radio Subway send the signal it takes two years to get there they immediately send a reply which takes another 2 years has her only been four years gone by on Earth where is if I got in a spaceship and left the same time the original message was sent at the speed of light then immediately turned around and came back which took another two years how many years we have gone by on Earth while I was traveling those four years at near the speed of light and does the radio signal go to time dilation to I would we get a reply just four years later and the person would come back hundreds of years later
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