Caution! The site can't guarantee, that text has age permission. The site is not recommended, if you are less than 18 years old.
The site shows example sentences for English words. How the word or phrase could be used in a sentence?
" ... But when you start looking at the details, that idea doesn't really seem to work. While Einstein and Rosen were right that in theory you could make a wormhole, it turns out they aren't stable. In principle space and time can be warped and bent in lots of interesting ways, but it wouldn't stay that way. Make a wormhole between distant stars, and the tunnel will collapse and pinch off before you have a chance to traverse it. Some folks suggested lining the wormhole with some kind of strong matter to keep it open, but it turns out that the mass of that matter would just cause the wormhole to collapse even more quickly. In the 1970s Kip Thorne and others showed you could line a wormhole with "exotic matter" to keep it open, but that exotic matter couldn't be any kind of matter that existed. Basically, you could make a transversable wormhole if you also had magic pixie dust. So much for that idea. ... "