We say a finite elastic surface is expanding when points on the surface are moving apart at different times. Therefore a moving object of constant speed will take longer time to traverse between two known points on the surface than an earlier time. We read and fascinated by theories about cosmology and the universe. One of such theories is that the universe has no boundaries and is expanding, sometimes with a constant rate, other times with a faster rate than what we thought. Its expansion is observed from the observation of increased separation between known cosmological objects increases over time. 

Earth and other planets in our galaxy are cosmological objects which should obey the same law and display similar behaviors, that the time these objects take to traverse a cosmological curve on their natural path of either rotation or revolution will be longer than it took them some cosmological time ago, unless the speed of revolution or rotation speed of these objects always change accordingly so that the time length remains the same. Therefore the length of time earth takes to complete a cosmological path of revolution around the sun which we call it one year or 365 days has to change, while the time of rotation may remain the same as it looks the time of rotation is invariant of the expansion of the universe unless earth itself increases in size. My question is : 

Is it observed that the time of revolution for earth increased to be more than 365 days and we have to change what we call one year ? What is really changing and what is not and which behaviors are affected by these changes? Is such a theory justified by empirical and unchanging evidences we encounter?  

I appreciate your ideas. 

Best regards,

Dejenie Alemayehu Lakew

More Dejenie Alemayehu Lakew's questions See All
Similar questions and discussions