Asked by: Terry Stanton, by email
According to Einstein’s General Relativity, which is our best current description of space and time, the only place where time – and also space – ends is in a so-called singularity. This involves gravitational forces becoming so intense that space and time lose all meaning.
![There are a few scenarios for the ultimate end of the Universe – if it ends in a Big Crunch, then time would lose all meaning © Getty There are a few scenarios for the ultimate end of the Universe – if it ends in a Big Crunch, then time would lose all meaning © Getty](https://c02.purpledshub.com/uploads/sites/41/2018/07/GettyImages-518386100-aade1b3.jpg?webp=1&w=1200)
While this is a theoretical possibility if the Universe collapses into a ‘Big Crunch’, observations suggest the current cosmic expansion will continue indefinitely.
Subscribe to BBC Focus magazine for fascinating new Q&As every month and follow @sciencefocusQA on Twitter for your daily dose of fun science facts.