If you are one of the 56,600 people who follow @DesignTimes on Twitter, then there's something you should know.
One of the account's latest tweets was of a
The #earth is not round. Here's earth without the oceans. pic.twitter.com/Wu5pRhXKCS
- Gary Pikovsky (@DesignTimes) September 19, 2015
Don't be fooled: While the GIF itself is scientifically accurate the tweet's explanation of what it shows is entirely false.
A quick look at the responses to this tweet can easily prove that:
Screenshot from Twitter
Screenshot from Twitter
Screenshot from Twitter
Models like these are called geoids, and this GIF is based on one of the most accurate geoids ever made, which was first released in 2011.
The model was based on two years of measurements taken from the European Space Agency's Gravity Field and Steady-State Ocean Circulation Explorer (GOCE) satellite, which maps the structure of Earth's mantle - the middle layer of the planet between the central core and outer crust.
You can see the original model below:
What it means to measure Earth's gravity
These types of geoid models are a helpful tool for climate scientists who want to understand how the ocean circulation and sea-level change will affect climate change.
To do this, the geoid removes all of the factors that help shape Earth's surface, such as tides, weather, and wind. When you do this, the only thing that's left is gravity.
The reason Earth appears lumpier is because it does not have a uniform mass - which is one of the key elements in measuring gravity. If you could sample different sections of Earth's mantle, you would get different materials of varying densities.
As a result, the denser parts of the mantle exert a stronger gravitational force on the water above compared to the less-dense regions. So where gravity is strong, you see low dips, shown in blue below, and where gravity is weaker, you see high piques, in red and yellow.
In reality, Earth would never look like the lumpy potato you see in a geoid model. The only way you could ever get our planet to take on such an alien shape is if you did all of the following:- Removed the moon
- Halted Earth's rotation about its axis
- Ceased its revolution around the sun
- Flooded it so every inch was covered with water
What's more, the model you see in the animation above emphasizes the valleys and hills, so that they are 7,000 times higher or deeper than they would look in reality.
Check out the complete geoid on YouTube or below: