4 ms·

Why is the "into the future" arrow pointing down? If increasing time is up, shouldn't the future be that way too?

• function_seven 8y ago
  This graph is meant to show what is observable. The past is up, and distances are along the x axis.
  • Aardwolf 8y ago
    The time scale for human experience is around a second or so to 100 years, which makes sense for what we experience, but I also don't understand what past and future mean in the diagram, the vertical axis seems to mean time duration rather than a time in past or future...
    • philipov 8y ago
      Observations take time. The y axis shows the duration of possible observations. Durations shorter than the plank time or longer than the current age of the universe are inaccessible; as are durations into the future, since we can only make observations in the past.