Resources
Q & A
Glossary
Acronym Guide
Further Reading
Outside the Site
Google Sky
WWT
Facebook
Youtube
Vimeo
Twitter
Flickr
Pinterest
Multimedia, Etc
Images/Illustrations
Animation & Video
Special Features
Chandra Podcasts
Chandra Mobile
Desktop Images
The Big Chandra Picture
High Res Prints
Presentations
Handouts
Screen Savers
Audio
Web Shortcuts
Chandra Blog
RSS Feed
Chandra Mobile
Chronicle
Email Newsletter
News & Noteworthy
Image Use Policy
Questions & Answers
Glossary of Terms
Download Guide
Get Adobe Reader
Q&A: General Astronomy and Space Science

Q:
Is it possible to travel into the future by traveling the speed of light around the Earth for an entire year inside a spaceship that is going the speed of light?

A:
No, but it might seem that way when you return to Earth. It is impossible for objects with mass to travel at the speed of light, but if you could devise a way to travel very close to the speed of light, clocks in your space craft will run more slowly than ones on Earth, so you would age more slowly. For example, if you travel for a year at 99.98% of the speed of light, you would find upon your return that everyone on Earth had aged 50 years.

Back | Index | Next