<P> Niagara Falls will have eroded away the remaining 32 km to Lake Erie, and ceased to exist . </P> <P> The many glacial lakes of the Canadian Shield will have been erased by post-glacial rebound and erosion . </P> <Tr> <Td> </Td> <Td> 50,000 </Td> <Td> The length of the day used for astronomical timekeeping reaches about 86,401 SI seconds, due to lunar tides decelerating the Earth's rotation . Under the present - day timekeeping system, either a leap second would need to be added to the clock every single day, or else by then, in order to compensate, the length of the day would have had to have been officially lengthened by one SI second . </Td> </Tr> <Tr> <Td> </Td> <Td> 100,000 </Td> <Td> The proper motion of stars across the celestial sphere, which is the result of their movement through the Milky Way, renders many of the constellations unrecognisable . </Td> </Tr>

What will happen to triton millions of year from now and why will this happen