light years
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Do you agree with the following quote about photons' mass?
Asked by luigirovatti | 29 responses -
Would someone explain "light years" to me?
Asked by john65pennington | 19 responses -
How do experts calculate and interpret large distances in the universe?
Asked by krrazypassions | 22 responses -
How can inter-galactic communication between humans and aliens be practical?
Asked by krrazypassions | 18 responses -
How can we tell the Universe is billions of years old?
Asked by Upward | 7 responses
