Mind Blowing Fact 2
The present is already the past.
Because light takes time to travel, everything you see happened in the past — even your reflection in the mirror is a few nanoseconds old.
Sources:
- NASA explains this general principle in their education materials:”Because light has a speed limit, when we look into space, we are looking into the past.”
Source: NASA – What Is the Speed of Light? - University of Illinois physics department explains the mirror effect:”If you’re standing one meter in front of a mirror, your reflection is about 6.7 nanoseconds old.”
Source: Ask the Van – University of Illinois - “Fundamentals of Physics” by Halliday, Resnick, and Walker — a widely used physics textbook — confirms that all observations involving light are delayed by its travel time