In a few inadequate words, to satisfy the intuitive quest for more nearly consistent answers, I maintain strange phenomena entailed in relative motion such as mass gain, shrinkage of length, slowing of clock, etc are easily seen to be the result of underestimating an object's velocity. Where its apparent speed is c, its actual speed would instead be infinite. This doesn't contradict Einstein but only gives us a different way of looking at time-at-a-distance
Let's say Albert and Marty synchronize clocks by the usual means, then later Isaac takes off at noon, almost instantly arriving at Mars 12:05 Marty's time, confirming that yes, Al, Marty must be 5 light minutes distant. But an explanation more welcome to the intuition says at Isaac's noon takeoff Marty's time is not also noon but instead 12:05
(I hasten to explain the above slightly simplified: Actually Isaac takes off from Victorville, Ca, passing Al noon in New York at apparent velocity c. Yes he's a very sturdy fella to withstand such acceleration
….and of course Isaac can't quite reach that speed because it's impossible)
By conventional relativity, at noon by Al's clock it's 11:55 to 12:05 on Marty's, depending on the observer's state of motion. So I merely ask Al to adopt Isaac's viewpoint, that the distant clock actually is
reading 12:05 at his takeoff.
So at any point in the Universe the individual may think of himself contained in concentric spheres each representing a successive time reading
Al's observation that Isaac gets heavier is because he underestimates Isaac's speed, the evident shrinking of Isaac's ship because he sees both front and rear of the vehicle at the same instant, and the "slowing" of his clock because the trip is in fact instantaneous