*This post may contain affiliate links. This means we may make a commission if you purchase an item using one of our links*
Asia has a surface area of 44.58 million sq. kilometers and a volume of 2.78 billion cubic kilometers while Callisto is a spherical entity with a surface area of 73 million sq. kilometers and a volume of 59 billion cubic kilometers. As a result it only makes sense that Callisto would be the bigger of the two as it is spherical whilst Asia is a mostly flat land mass.
Continue reading to discover what makes both bodies as big as they are and to discover the larger regions and objects that can be spotted within each of their surfaces.
How Big Is Asia?
Asia is the biggest continent on Earth, covering an area of 44,579,000 square kilometers, equal to 30% of the total land area of Earth or 8.7% of the planet’s total surface area. Asia possesses the highest and lowest points on Earth’s surface, plus it has the longest coastline of any continent.
Asia contains two of the three largest countries in the world: Russia and China, and it holds roughly 60% of the world’s population, with around 4.7 billion people.
We can divide Asia into five major physical regions: mountain systems, plains and deserts, plateaus, saltwater areas, and freshwater environments. Among the most impressive geographic features of the continent are the Himalayas, which extend 2,500km across the Southeast and separate the Indian subcontinent from the rest of Asia.
The Himalayas cover over 612,000 square kilometers of land; they are so vast that they contain three different mountain belts: the Greater Himalayas, Lesser Himalayas, and Outer Himalayas. The Greater Himalayans possess the highest average elevation at 20,000 feet. It also contains nine of the world’s highest peaks, which are all over 26,000 feet tall.
Asia boasts the highest mountain in the world, Mount Everest, which stands at 29,032 feet. The continent also possesses several plateaus, including the vast Iranian plateau, which covers more than 3.6 million square kilometers.
Meanwhile, the West Siberian Plain of central Russia is one of the largest continuous flatlands in the world. This plain has a length of 2,400 kilometers and a width of 1,900 kilometers; over 50% of its total area is lower than 100 meters above sea level.
Asia extends to a length of 11,000km between the Arctic Circle and the Indian Ocean; its width of 8,500km stretches from the Ural Mountains to the Pacific Ocean.
Lastly, if we were to say that the average thickness of Asia’s crust fell around 40km, it would have a volume of 2.78 cubic kilometers. This makes it larger still and a significant amount more than all the other continents present on Earth.
How Big Is Callisto?
Callisto is a moon of Jupiter and the third largest moon in the Solar System, which was discovered in January 1610 by Galileo Galilei.
The diameter of Callisto is 4,820.6km, while its surface area is 73,000,000 sq. km, a far greater expanse than that of the Asian continent. Still, like our seventh largest country, the terrain of Callisto varies, and it is the most heavily cratered object in our solar system.
Calisto’s volume is an impressive 59,000,000,000 cubic km, giving it a similar size to the planet Mercury (60.8 billion cubic km). Callisto is classified as a moon and not a planet because it orbits Jupiter rather than the Sun. Still, it is one of the largest moons in the Milky Way and covers an impressive expanse.
This mega moon is 99% as big as Mercury, but it only possesses a third of its weight because of the moon’s mixed composition.
Callisto’s average density is 1.83 cubic cm, which suggests that it is made of roughly equal parts of water ice and rocky material, plus additional volatile ices (like ammonia). Scientific research into the moon suggests that 49-55% of its total constitution is ice. The remaining rock is likely composed of silicates, chondrites, and iron oxide.
Still, the water ice only accounts for between 25 and 50% of the planet’s overall mass.
The surface of Callisto is heavily cratered and has a dark appearance. Scientists believe that the bright patches consist mainly of ice, while the darker patches show areas where the ice has eroded. The most distinctive crater is Valhalla, with its bright central region.
In the past, many scientists thought this huge “hunk of rock and ice” was “boring” because it had no shifting tectonic plates and no volcanic activity. At first appearances, it seemed to be a dead world.
Still, more recent research by NASA scientists concludes that Callisto could house a salty ocean interacting with rocks that are more than 250 km below the surface. Combine this with detections of oxygen in the exosphere, and today Callisto is included in the list of places where life could exist beyond Earth.
Callisto is 180 times farther from Earth than our moon, but its large amount of surface ice makes it shine brighter than our moon. Earth’s moon reflects only 0.12% of the Sun’s light, whereas Callisto reflects up to 20%.
Summary
Asia is the largest flat land mass on Earth however, Callisto is still the 3rd biggest moon in our solar system therefore, even if Asia does eclipse Jupiter’s moon in diameter, it doesn’t hold a candle in any of the other metrics.
In regards to surface area Callisto is around 60% larger but its mostly in volume where it shows how much smaller Asia is, where Callisto is over 20 times Asia’s volume. In the end of the day, spherical objects are designed to be bigger when everything is broken down so, it only makes sense Callisto would be bigger overall.