Letters to the Editor, The Boston Globe, P.O. Box 2378, Boston, MA 02107-2378. If you don't like the 21st century, you can always go back By Douglas Bailey, Globe Staff Space, Captain James T. Kirk used to say, is the final frontier. As we enter the 21st century, space travel has become passe.
Time is the next, and possibly final, frontier.
And its barrier could be broken sooner than you think. While time travel has been the stuff of science fiction for more than 100 years, it is only recently that physicists have begun seriously researching the topic. Most will tell you that they think time travel is impossible and that their research is intended only to expand our understanding of the nature of time, space, relativity, and such things as wormholes and negative mass, called antimatter. Don't believe them. So physicists tend to keep quiet about it.