https://www.livescience.com/universe-may-be-curved.html

Everything we think we know about the shape of the universe could be wrong. Instead of being flat like a bedsheet, our universe may be curved, like a massive, inflated balloon, according to a new study.

That's the upshot of a new paper published today (Nov. 4) in the journal Nature Astronomy, which looks at data from the cosmic microwave background (CMB), the faint echo of the Big Bang. But not everyone is convinced; the new findings, based on data released in 2018, contradict both years of conventional wisdom and another recent study based on that same CMB data set.

Flat like a bedsheet? Is that the best they could do? My bedsheets aren't particularly flat even when the bed is made. They curve around the mattress, so they could actually be shaped like the universe.