• zea@lemmy.blahaj.zoneEnglish
    0·
    3 months ago

    If the sun disappears when? According to GR’s conception of simultaneous events, it disappears immediately.

    • tate@lemmy.sdf.orgEnglish
      0·
      3 months ago

      Which two event are you talking about being simultaneous? The Sun going out and Earthers observing it? Those things will not be simultaneous in any reference frame, because they are “light-like” separated. (ie they lie on a 45 degree line in a Minkowski plot.)

      • Zink@programming.devEnglish
        1·
        3 months ago

        Yep. Imagine you’re off in space such that you, the sun, and the earth make an equilateral triangle. The sun disappears, then after 8 minutes you see it disappear. Then after ANOTHER 8 minutes you see the earth go dark, because that light had to cover two of the 8-light-minute long legs of the triangle.