The geoid is a complicated concept, especially if you’re not one of the several experts I begged to explain it. After all, it’s not a shape we can see naturally. “We cannot measure it,” E.

It may look like a mangled lump of Play-Doh, but this colorful object is actually the most accurate digital model yet of Earth's gravity field, scientists say. Released last week, the gravity map ...

That’s true here! How? Another way to describe the geoid is that it’s the shape of an object if it’s perfectly fluid; if the surface is allowed to flow freely. For a perfectly homogeneous ...