@BillW,
Quote:I am new here, so if I am repeating what has occurred previously, please excuse me.
Time is relative, by definition, that means it can't be linear. The major variance factors are speed one is moving through space and gravity. If we graft it, these grafts are dependent on each independent person. We, being earthlings, live in an environment where we get very minor time differences in our dependent factors to affect our individual grafts. So, 50 years old for each of us is almost equal. The people with the most variability are astronauts. Gennady Padalka and Scott Kelly most assuredly have the most time variability of anyone known ever to have lived on earth.
When astronauts return back to earth after being 6 months in the space station, they come with lots of health failures or bad conditions.
Their low level of red cell production in blood is notorious. A 40 years old astronaut returns with osteoporosis of a 70 years old senior dude, their minds suffer of disorientation, and recently in the space station a special sensor showed that besides of acquiring distorted bodies, the heart of the astronauts turn to a spherical shape.
After their return, some of them must stay in recovery for up to two years.
At the end of the day, 30/40 years middle age astronauts who stayed in outer space for 6 months returned with the body/health of a 70 plus years old person.
But, the idiotic relativist affirms that -according to the theory of relativity- these astronauts have returned back to earth a millionth of a second younger...
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The measure of time is not linear or circular, it is just a measure.