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What Happens To Your Body In A Year?

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A year is just a quick spin around the sun. A 365-day solar system lap. But in that stretch of time, a lot happens—in space, on Earth, and even inside your body. Your body is constantly at work to keep you alive and kickin', and looking at all the ways your body changes in a single year is both surprising and cool as hell.

Related: How Old Is Your Body?

That's A Lot Of Lost Skin

In a single year, you'll lose about 4 kilograms (8.8 pounds) of skin cells and 27,000 hairs. But your body will also make a lot in one year: you'll produce 3.5 centimeters (1.4 inches) of fingernails, 15 centimeters (5.9 inches) of hair, 73 trillion red blood cells, 1,400 liters (370 gallons) of sweat, 360 liters (95 gallons) of saliva and 80 liters (21 gallons) of tears. That's one busy body.

Related: Why Your Body Does Weird Things

Oh, But That's Not All

The World Science Festival has information on more amazing (or gross, depending on your outlook) things your body does in a year: You'll expel about 511 liters (135 gallons) of urine, your heart will beat 40 million times, and your blood will travel 7,048,928 km (4.38 million miles). So even on your most sluggish days on the couch, take comfort in the fact that your bod is still very hard at work. Thanks, body!

Related: How Many Atoms Are In Your Body?

Watch And Learn: Our Favorite Videos On Scientific Views Of Time

How Science Defines A Year

So much happens to the world in a year, and even inside your body.

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Key Facts In This Video

  1. In a single year, you'll lose about 4 kilograms (8.8 pounds) of skin cells and 27,000 hairs. 01:28

  2. In a single year, Earth travels 940 million kilometers (584 million miles) around the sun. 02:33

  3. The word "year" comes from the Greek word "hora," meaning season. 03:02

What Will Our Planet Look Like in 100 Years?

Some people may predict it'll look pretty grim, but that may not be the case.

What Will Happen in the Next 100 Million Years?

Sure, why not look way, way into the future?

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Key Facts In This Video

  1. In 36,000 years, Earth will gain a new closest star: Ross 248. 00:30

  2. The giant star VY Canis Majoris gives off as much energy in six seconds as our sun gives off in a year. 01:01

  3. In one million years, a star may appear on Earth as large as the full moon and be visible in daytime. 01:31

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