From the July 2010 issue

I’ve heard that wormholes could make time travel in the future possible. How realistic is this phenomenon?

Harold Kozak, Staten Island, New York
By | Published: July 26, 2010 | Last updated on May 18, 2023
Artist’s rendition of a wormhole.
Allen McC.

Wormholes would likely be unstable and would collapse on themselves the moment they were created. They don’t seem all too promising for time travel.