Direct measurements reveal how Jupiter and Earth differ in ways that go beyond appearance. Jupiter is a giant planet dominated by light gases, while Earth is a compact rocky world with a comparatively thin layer of air. These observations allow researchers to compare jupiter and earth using the same physical metrics, especially size, atmospheric structure, and gravity.
Comparisons also require a shared definition of the place where conditions are quoted. Earth has solid ground and an atmosphere that thins rapidly with height. Jupiter does not have a solid surface, so many values are reported at a level in the atmosphere where the pressure equals one bar, similar to sea level pressure on Earth. This reference level supports consistent discussion of temperature, winds, and gravitational acceleration.
NASA measurements compiled in the Planet Compare dataset show that Jupiter’s equatorial radius is about 69,911 kilometers, compared with about 6,371 kilometers for Earth. That makes Jupiter close to eleven times wider. The difference in volume is larger still. Using the same NASA values, Jupiter’s volume is about 1,321 times Earth’s volume, and its mass is about 318 times Earth’s. Density highlights that the two planets are built from very different material. NASA lists Earth at about 5.513 grams per cubic centimeter and Jupiter at about 1.326 grams per cubic centimeter. Earth’s high density reflects a rocky and metallic interior. Jupiter’s lower average density reflects a planet dominated by hydrogen and helium, with gases compressed into dense fluids at depth.
Earth’s atmosphere is shaped by chemistry and by constant exchange with oceans and land. Near the surface it is about 78 percent nitrogen and 21 percent oxygen, with about 1 percent made up of other gases such as argon, carbon dioxide, and neon, as described on the Earth facts page. Because most of the air’s mass sits close to the ground, pressure drops steeply with altitude. Weather and climate are therefore organized within a thin shell above the surface, and the solid crust forms a clear boundary between air and ground.
Jupiter’s atmosphere is different in both composition and physical depth. NASA describes Jupiter’s belts, zones, and long lived storms as clouds and hazes embedded in an atmosphere of hydrogen and helium, with ammonia and water central to visible cloud features. The NASA Jupiter facts summary describes a layered cloud system, with ammonia ice expected in the highest deck, ammonium hydrosulfide in a deeper layer, and water ice and vapor deeper still. With no solid surface to interrupt circulation, atmospheric pressure and temperature rise steadily with depth, and gases transition into dense fluids rather than ending abruptly at terrain.
Observations by NASA’s Juno spacecraft since it entered orbit in 2016 have provided direct constraints on how far down Jupiter’s atmospheric motions extend. NASA reports that Juno data show some major vortices reach well below the visible cloud tops. For the Great Red Spot, Juno gravity measurements constrained the storm’s depth to about 500 kilometers beneath the clouds, indicating a substantial column of moving gas whose mass can be inferred from its gravitational signature. NASA also reports that the alternating jet streams that separate Jupiter’s belts and zones extend to depths of about 3,200 kilometers, confirming that the banded wind system is linked to much deeper layers than the upper clouds alone.
Gravity provides the most direct numerical comparison between the two planets. In NASA’s planetary comparison data, Earth’s surface gravity is listed as 9.80665 meters per second squared. Jupiter’s gravity at the one bar reference level is listed as 24.79 meters per second squared, about two and a half times stronger. Jupiter’s gravity is not hundreds of times Earth’s because its radius is also much larger, which reduces gravitational acceleration at the outer boundary for a given mass. Even so, the stronger pull helps produce rapid increases in pressure with depth, contributing to a thick atmospheric column and to deep wind systems that can be detected through their influence on the gravity field.
Taken together, these measurements show two planets shaped by very different physics. Jupiter’s immense size and mass support a deep hydrogen and helium atmosphere where compression, layered clouds, and stronger gravity shape weather on a global scale. Earth’s smaller size and higher density support a thinner nitrogen and oxygen atmosphere concentrated close to the surface.
References
National Aeronautics and Space Administration. (2025). Planet Compare. https://solarsystem.nasa.gov/planet%2Dcompare/
National Aeronautics and Space Administration. (2025). Facts About Earth. https://science.nasa.gov/earth/facts/
National Aeronautics and Space Administration. (2025). Jupiter Facts. https://science.nasa.gov/jupiter/jupiter%2Dfacts/