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Our only measure of location would be compared to Earth, and our measure of time would be Earth time (revolutions around the sun and rotations). What if we come across some friendly aliens and we want to communicate with them. There home planet would have a longer or shorter year and they would not compare there location to

*our*earth. So we and all our alien friends would need a constant location that would never move. I think the center of the universe (place of the big bang) would be a good place. However if we were going to make a 3D plane with the origin at the center of the universe, we would need 3 noncollinear points to mark such plane. We would need a unit of time also. I think we could use a hydrogen atom. We could multiply the diameter by a few billion, and we have an extremely precise measurement of distance. We would also need a constant in time. but we would need two points to mark a line. The first point would probably be the origin of the universe in time (the time of the big bang). The other point could be a unit of time. We could say it is 4 billion or so years from the beginning of space, however our alien friends have a different year than us. So we need another constant in time. I think we would use the speed of light and a distance to do this. Light will always take the same amount of time to go X distance, therefore we need a constant distance. Again we could use a hydrogen atom(multiplied by a few billion of course) and see how long it takes light to go that far, and multiply that by a hundred or so, and then we have constant unit of time to compare to the beginning of the universe.

So, can you come up with anything better for a unit of time or distance? Also we still need two more points noncollinear points compared to the center of the universe.

P.S. Thank you for reading that if you did. : )