The Moon
Well, honey, the object closest to the Earth in all three systems (metric, imperial, and astronomical) is the Earth itself. I mean, who else is gonna be closer to the Earth than the Earth? It's like asking who's the closest to Betty White in sass – it's Betty White, darling.
No, a coin is not a sphere. Coins are typically circular in shape, and their structure is flat with two sides. A sphere is a three-dimensional round object in which all points on its surface are the same distance from its center.
The night stars are farthest from the Earth. The other three objects -- Sun, Moon, and Mars -- are all within the Earth's solar system.
Three
UFO is not a word. It is a TLA (three-letter-acronym) for the three-word-phrase "Unidentified Flying Object".
The Moon
The object farthest from the center in all three systems would likely be a distant galaxy due to the immense distances involved. Given the vast scale of the universe, galaxies are the most likely candidates for being farthest away from the centers of their respective systems.
The Moon
The Voyager 1 spacecraft, launched by NASA in 1977, is the farthest human-made object from the center in our solar system. In our galaxy, the Milky Way, there are stars and other celestial objects much farther from the center. And in the universe, there are galaxies and galactic clusters that are billions of light-years away from their centers.
circle
Norway, Sweden, and Finland are the three countries in Europe that are the farthest North. If you look at a map Norway is the farthest North out of those three, but only by a small chunk of land.
Center of Gravity is the average location of an object's weight. For symmetrical objects it is the same location as the geometric center. Example, a dumbell with equal spherical masses at each end is symmetric about lines drawn thru its center, so the geometric center is midway between the end masses. This is also the center of gravity because the average location of the weights (same amount to the left as to the right) is at the geometric center. For working force problems an object's weight is always a force to be considered. When drawing force vectors the object's weight can be considered as located at its center of gravity. The center of gravity of an object can be found experimentally by finding points where it can be balanced. Draw an imaginary line vertically up, thru the object, from the balance point. Then rotate the object 90 deg and find another balance point and draw a second ,imaginary, vertical line. Then rotate the object 90 deg in a different direction and find a third vertical line. The point ,inside the object, where the lines cross, is its center of gravity. You need three lines for a three dimensional object so you get the balance point in all three spatial directions.
That is a sphere.
Sphere.
A sphere perhaps?
A sphere, globe, or ball.If the word missing from the question is "distance",then the object is a sphere,
Estonia is the farthest north of those three countries. They are Baltic Nations.