I find this explanation pretty intuitive: 1. I left Earth at 0.75c and haven't accelerated or decelerated since 2. I receive a message from Earth that an obje

I find this explanation pretty intuitive: 1. I left Earth at 0.75c and haven't accelerated or decelerated since 2. I receive a message from Earth that an object is heading my way at 0.75c (far enough away for them to message me at 1c before it hits me) 3. I look where they point and see the object approaching at 0.96c 4. I'm not confused because I fully realize that relative to Earth, my brain and my instruments are running slower due to time dilation. Speed is a time-related measure (d/t) -- you can't use relative distance and absolute time to calculate (d/t). You use relative values for both. So the speed I get when I divide by my t is different to what Earth gets when it divides by it's t. The problem arises when people accidentally assume an absolute vantage point to observe the two objects. A scientist on Earth will see the gap between the 2 objects close at 1.5c, but he'll know better than to make the usual assumption we make on Earth -- that everyone else will see the gap close at the same rate (because time will be slower for some observers).