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2. Proper time - Wikipedia

   en.wikipedia.org/wiki/Proper_time

   The proper time interval between two events on a world line is the change in proper time, which is independent of coordinates, and is a Lorentz scalar. [1] The interval is the quantity of interest, since proper time itself is fixed only up to an arbitrary additive constant, namely the setting of the clock at some event along the world line.

3. Comoving and proper distances - Wikipedia

   en.wikipedia.org/wiki/Comoving_and_proper_distances

   On this usage, comoving and proper distances are numerically equal at the current age of the universe, but will differ in the past and in the future; if the comoving distance to a galaxy is denoted , the proper distance () at an arbitrary time is simply given by = where () is the scale factor (e.g. Davis & Lineweaver 2004). [2]

4. Proper length - Wikipedia

   en.wikipedia.org/wiki/Proper_length

   A different term, proper distance, provides an invariant measure whose value is the same for all observers. Proper distance is analogous to proper time. The difference is that the proper distance is defined between two spacelike-separated events (or along a spacelike path), while the proper time is defined between two timelike-separated events ...

5. 10 Hard Math Problems That Even the Smartest People in the ...

   www.aol.com/10-hard-math-problems-even-150000090...

   Goldbach’s Conjecture. One of the greatest unsolved mysteries in math is also very easy to write. Goldbach’s Conjecture is, “Every even number (greater than two) is the sum of two primes ...

6. Coordinate time - Wikipedia

   en.wikipedia.org/wiki/Coordinate_time

   A fuller explanation of the concept of coordinate time arises from its relations with proper time and with clock synchronization. Synchronization, along with the related concept of simultaneity, has to receive careful definition in the framework of general relativity theory, because many of the assumptions inherent in classical mechanics and classical accounts of space and time had to be removed.

7. 10 Fast-Food Chains That Never Freeze Their Beef - AOL

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   In addition to beef, they offer options like bison, lamb, and plant-based patties, all topped with gourmet ingredients and house-made sauces. For more fast-food stories, sign up for our free ...

8. NYT ‘Connections’ Hints and Answers Today, Saturday, January 11

   www.aol.com/nyt-connections-hints-answers-today...

   Spoilers ahead! We've warned you. We mean it. Read no further until you really want some clues or you've completely given up and want the answers ASAP. Get ready for all of today's NYT ...

9. Experimental testing of time dilation - Wikipedia

   en.wikipedia.org/wiki/Experimental_testing_of...

   Time: The interval between two events present on the worldline of a single clock is called proper time, an important invariant of special relativity. As the origin of the muon at A and the encounter with Earth at D is on the muon's worldline, only a clock comoving with the muon and thus resting in S′ can indicate the proper time T′ 0 =AD.