Earth is not only the place we call home, it's also ripe with scientific wonder and spectacular beauty. It also, is capable of some pretty cool things that you may not have even known! Below, check out ten of the coolest things we learned about Planet Earth!
1. Earth is 4.5 Billion Years Old
How do we know this? In order to find out the age of the Earth, scientists look at rock and sediment and try to determine the age of that piece of sediment. It's not as easy as one may think, however. The processes of plate tectonics mean that the Earth is constantly recycling its rock, breaking it down into magma in the interior before pumping it back up to the surface once more. The oldest rock they've discovered comes from Austrialia, and is the basis for scientists estimations for Earth's age. 4.5 Billion years old, that's a lot of birthday cake!
2. One Year on Earth Isn't 365 Days
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It’s actually 365.2564 days. It’s this extra .2564 days that creates the need for a Leap Year once every four years. That’s why we tack on an extra day in February every four years – 2004, 2008, 2012, etc. The exceptions to this rule is if the year in question is divisible by 100 (1900, 2100, etc), unless it divisible by 400 (1600, 2000, etc).
3. The Many Moons of Earth?
Technically, the Earth has just a single moon. However, Earth has two orbitals called 3753 Cruithne and 2002 AA29, which are part of a larger population of asteroids known as Near-Earth Objects (NEOs). The asteroid known as 3753 Cruithne measures 5 km across, and is sometimes called “Earth’s second moon”. It doesn’t actually orbit the Earth, but has a synchronized orbit with our home planet. It also has an orbit that makes it look like it’s following the Earth in orbit, but it’s actually following its own, distinct path around the Sun.
4. Antarctica
Did you know Antarctica is actually considered a desert? Inner regions get just 2 inches (50 millimeters) of precipitation a year (typically as snow, of course). Despite Antartica's desert-like climate, it also contains 70% of the Earth's freshwater and 90% of the Earth's ice!
5. Earth Has a Lead Foot
The Earth moves around the Sun at 67,000 miles per hour. Try clocking that on a police radar gun!
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