Working Definition for "The Universe"
The universe is that which contains and
all of the laws of nature and everything
subject to those laws. (John Hawley and Katharine Holcomb,
"Foundations of Modern Cosmology")
subsume: to classify within a larger
category or under a general principle
The universe contains all that is physical, including
SPACE and TIME.
Neither space nor time is an absolute quantity.
Two observers with identical clocks and identical rulers will measure
different lengths for a particular object and
different amounts of time that pass between two
- one observer is moving with respect to the other at a constant velocity
- the observers are experiencing different accelerations due to gravity
Atomic clocks are so accurate that these effects
can be measured on a single transatlantic flight! (JFK to Heathrow)
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