Are time machines possible?
Is going back in time really possible? If so, would we have the resources to do it..say 100 years from now?
It may be, it may not be. The laws of physics that we know about don't seem to forbid it. The easiest way to do it would be with a worm-hole, a sort of "short cut" from one part of the universe to another. There are ways (in principle) of creating a worm-hole with one mouth in the present and one mouth in the past, so that if you went through it, you would be travelling back into the past. There are reasons to believe, however, that such a wormhole would be unstable. The matter is still very undecided. In any case, you would not be able to go back and change recorded history, since everything you do in the past must be consistent with the state of things in the future. Nor could anyone come back from the future to the present period, because you can only go as far back, using this method, as when the wormhole is first created. We also would not have this technology (if it is possible at all) for many thousands of years, I'm sure.
Get More 'Curious?' with Our New PODCAST:
- Podcast? Subscribe? Tell me about the Ask an Astronomer Podcast
- Subscribe to our Podcast | Listen to our current Episode
- Cool! But I can't now. Send me a quick reminder now for later.
How to ask a question:
If you have a follow-up question concerning the above subject, submit it here. If you have a question about another area of astronomy, find the topic you're interested in from the archive on our site menu, or go here for help.Table 'curious.Referrers' doesn't existTable 'curious.Referrers' doesn't exist
This page has been accessed 30975 times since September 29, 2002.
Last modified: February 13, 2004 10:35:13 PM
Ask an Astronomer is hosted by the Astronomy Department at Cornell University and is produced with PHP and MySQL.
Warning: Your browser is misbehaving! This page might look ugly. (Details)