Is it true that if you spend 5 years in space it's equivalent of 50 years to people on Earth?
Is it true that if you spend 5 years in space it's equivalent of 50 years to people on Earth? That depends on how fast you're traveling. Thanks to Einstein, we know that the faster you go, the slower time passes--so a very fast spaceship is a time machine to the future. Five years on a ship traveling at 99 percent the speed of light (2.5 years out and 2.5 years back) corresponds to roughly 36 years on Earth.
Is the Earth closer to the sun than 100 years ago?
Overall, the Earth isn't even spiraling in toward the Sun; it's spiraling outward, away from it. So are all the planets of the Solar System. With every year that goes by, we find ourselves just slightly — 1.5 centimeters, or 0.00000000001% the Earth-Sun distance — farther away from the Sun than the year before.
Are humans aging slower?
The study found that biological age is lower for recent periods across all age groups, but the difference varies based on age and gender. The scientists think that changes in smoking, obesity, and medication use are partly the reason.