Postcard: Near-Light-Speed Travel
NASA's Goddard Space Flight Center
August 28, 2025
| Credit | NASA's Goddard Space Flight Center |
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If you take a trip at near the speed of light, you won't just feel younger when you get back. You'll BE younger!* Send this postcard to your friends the next time you return from a trip at near light speed.
*compared to friends that stayed behind.