How Much Does The Earth Weigh

by Jerry Coffey on November 12, 2010

How Much Does The Earth Weigh

Earth view from Apollo 11

How much does the Earth weigh is a straightforward question and there is a simple, straightforward answer: it weighs 5.9736×1024kg. Weight alone does not give you enough of the Earth’s vital statistics, so here are a few more.

The Earth has a mean radius of 6,371 km, an equatorial radius of 6,378.1 km, and a polar radius of 6,356.8 km. Those measurements help define why the Earth is referred to as an oblate spheroid instead of a perfect sphere.

The Earth has a total surface area of 510,072,000 km2. Water covers 361,132,000 km2 while land covers the remaining 148,940,000 km2, so water covers 71% and land covers 29%.

Earth is the largest of the terrestrial(rocky) planets. The surface and mantle are made up of 32% iron, 30% oxygen, 15% silicon, 14% magnesium, with the remaining 9% made up of a great number of elements. Conversely, the core is thought to consist or nearly 90% iron.

The internal heat of the Earth comes from residual heat leftover from accretion and radioactive decay. Potassium-40, uranium-238 and 235, and thorium-232 are the isotopes that are mainly responsible for the heat created within the planet.

The Earth orbits the Sun at an average distance of about 150 million km every 365.2564 mean solar days(sidereal year). It takes the Earth on solar day to rotate upon its axis. The Earth orbits at 30 km/s or 108,000 km/h.

This is a lot more information other than how much does the Earth weigh, but it helps you to understand what makes up the Earth’s total weight.

We have written many articles about the Earth for Universe Today. Here’s an article about the mass of the Earth, and here’s an article about the center of the Earth.

If you’d like more info on Earth, check out NASA’s Solar System Exploration Guide on Earth. And here’s a link to NASA’s Earth Observatory.

We’ve also recorded an episode of Astronomy Cast all about planet Earth. Listen here, Episode 51: Earth.

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