All objects in the cosmos exist in the omnipresent NOW.
Regrettably, mathematicians don’t believe they exist in the omnipresent NOW.
Mathematicians remember the past while they exist in the omnipresent NOW.
Mathematicians perceive the future while they exist in the omnipresent NOW.
Mathematicians theoretically manipulate the past and the future in mathematical formulae.
Unfortunately, mathematicians suffer from delusions of grandeur because they believe their mathematical manipulations prove they don’t live in an omnipresent NOW cosmos.
In physics, spacetime is any mathematical model that combines space and time into a single continuum.
Basically, mathematicians suffer from a severe case of real world denial.
This neurosis spread rapidly through the scientific community during in the twentieth century “as a consequence of Einstein’s 1905 theory of special relativity”.
While spacetime can be viewed as a consequence of Einstein’s 1905 theory of special relativity, it was first explicitly proposed mathematically by one of his teachers, the mathematician Hermann Minkowski, in a 1908 essay building on and extending Einstein’s work.
Unfortunately, this neurosis appears to incapacitate rationale thought processes.
A classic example is Einstein’s concept of “time dilation” which was experimentally tested using two synchronised clocks which were shown to be unsynchronised at the end of the experiment.
Gravitational time dilation is an actual difference of elapsed time between two events as measured by observers differently situated from gravitational masses, in regions of different gravitational potential. The lower the gravitational potential (the closer the clock is to the source of gravitation), the more slowly time passes. Albert Einstein originally predicted this effect in his theory of relativity and it has since been confirmed by tests of general relativity.
This has been demonstrated by noting that atomic clocks at differing altitudes (and thus different gravitational potential) will eventually show different times. The effects detected in such experiments are extremely small, with differences being measured in nanoseconds.
Gravitational time dilation has been experimentally measured using atomic clocks on airplanes. The clocks aboard the airplanes were slightly faster with respect to clocks on the ground. The effect is significant enough that the Global Positioning System’s artificial satellites need to have their clocks corrected.
A rational conclusion would be that the experiment interfered with the accuracy of the clocks [which are not infallibly reliable].
A totally irrational conclusion is that the experiment demonstrates “time dilation”.
Unfortunately, the self-deluded mathematicians have received even more funding so that they can produce even more delusional mathematical models that include black holes where time can stop.
A black hole is a region of spacetime from which gravity prevents anything, including light, from escaping.
Oppenheimer and his co-authors interpreted the singularity at the boundary of the Schwarzschild radius as indicating that this was the boundary of a bubble in which time stopped.
In the real cosmos clocks stop but the omnipresent NOW never stops.