Here's all you need to know about Scott Kelly; the astronaut who spent 340 days in space!

THE SPACE DUDE?

Yes. The space dude has returned to Earth and how!

HOW?

Well, after an impressive year-long jaunt in space, Kelly, who touched down in Kazakhstan, is two inches taller and 1/100 seconds younger now.

TALLER & YOUNGER?

Yes. Did you know that astronauts aboard the International Space Station ( ISS) grow up to 3% taller? Most likely because the spine has a chance to elongate with less pressure from gravity.

WOW! THAT IS SOME SCIENCE.

Don't exult though. The newfound effect is only temporary — gravity is going to drag him back down to size eventually — so Kelly should enjoy his new stature for as long as he can.

OK, EXPLAIN THE NATURE-DEFYING YOUNGER PART.

That explanation is a little tricky. Heard of Einstein? His theory of general relativity?

I'M LISTENING.

If two objects are moving at different speeds, time runs more quickly for the slower object — a phenomenon called time dilation. Kelly has been moving much faster than us: the ISS travels at around 27,600 km per hour relative to our planet.

NOT GETTING THE MATH HERE.

Ok. Get this. If you factor in the 340 days Kelly spent on the ISS, it means he is now roughly 8.6 milliseconds younger.

ALL I CAN SAY IS — SPACE IS BY FAR THE BEST PLASTIC SURGEON.

Yes, if you are willing to travel 232 million km through space, circle the world 5,440 times and experience 10,880 orbital sunrises and sunsets in a 340-day-long spaceflight, space is the place for you.

ALL ABOARD!

Also, you might not get to shower for a year — but those are only minor sacrifices in the pursuit of youth and beauty, aren't they?