A recent analysis envisions what it would be like to communicate with a spacecraft traveling ... speed of light experiences time dilation. Its clock slows down. So for someone on board, the ...

Jenny Lisle you send the spaceship at the same ... the closer we come to traveling at the speed of light (186,000 miles per second), the more time would appear to slow down for us from the ...

A series of new animations by a NASA scientist show just how zippy — and also how torturously slow — the speed of light can be ... in space at the precise time so that they don't miss their ...

A spacecraft traveling at one-tenth of the speed of light could shave the trip down to a quick 40 years. Future engineers could use nuclear power to achieve that, says Scott Bailey, an engineer at ...