Ok, I went through a video to understand it more simply. But there is one point I just don't understand. Which is this: How does Adam think others' clock is SLOW? Shouldn't it be FAST? Here's my breakdown of the video: Adam is in- Space Sarah is on - Ground Beam of light shone from the spaceship According to the person on EARTH - Takes a longer time for the light to reach the spaceship back due to a V shape According to the person on the SPACESHIP - Takes a shorter while for the light to return back to the ship The person on EARTH sees the time passed as MORE The person on the SPACESHIP sees the time passed as LESS The person on EARTH sees the time passed as MORE (1 hour), The person on the SPACESHIP sees the time passed as LESS (1 minute) FOR the person ON EARTH, the clock on the spaceship is SLOWER (BECAUSE for her, the time passed on HER clock is 1 HOUR, but the time passed on HIS clock is JUST 1 MINUTE, hence his is SLOWER compared to hers, hence time is moving SLOWER on HIS clock and FASTER on HER clock) FOR the person ON THE SPACESHIP, the clock on the EARTH is FASTER - Right?? How does Adam view the clock on Earth as SLOW? Can someone please explain this..Thanks!