Jupiter – The Largest Planet

As we all know, Jupiter is the fifth planet from our Sun. It is the largest planet in the solar system. More than twice as big as all the other planets combined together.

Jupiter has cold stripes and swirls, windy clouds of ammonia and water.  It is floating in an atmosphere of hydrogen and helium.

Its very famous Great Red Spot is a giant storm far bigger than Earth that has raged for hundreds of years.

It is surrounded by dozens of moons. It actually seems like another Jupiter System in itself.

Jupiter also has many rings. But not as beautiful as the rings of Saturn. Jupiter’s rings are very dull and made of dust, rather than ice.


Up to now, nine spacecraft have studied Jupiter up close. NASA’s Juno spacecraft is currently studying the gas giant planet from orbit.   

The first spacecraft was sent to Jupiter in July 2016 into it’s mysterious, cloud-shrouded interior.

Scientists also regularly check in on Jupiter using the Earth-orbiting Hubble Space Telescope and ground-based telescopes. The first spacecraft to fly past Jupiter was Pioneer 10.  It was followed by Pioneer 11Voyager 1 and Voyager 2 flybys. 

NASA’s Galileo mission was first to orbit Jupiter and to send an atmospheric probe into the stormy clouds. The international Ulysses mission used Jupiter’s powerful gravity to hurl itself into orbital passes of the Sun’s northern and southern poles. 

Both Cassini and New Horizons studied Jupiter as they hurtled on to their main science targets. The targets were Saturn for Cassini and Pluto and the Kuiper Belt for New Horizons.

Two new missions are in the works to make close studies of Jupiter’s moons NASA’s Europa Clipper and ESA’s JUpiter ICy Moons Explorer (JUICE).

Jupiter holds a none to second place in the history of space exploration. In 1610, astronomer Galileo Galilee used a newly invented equipment called the telescope to look at Jupiter.

He found the first moon known to exist beyond Earth. The discovery ended incorrectly, ancient belief that everything, including the Sun and other planets, orbited the Earth.

Size and Distance

Jupiter has a radius which eleven times wider than that of Earth. It has a radius of  43,440.7 miles (69,911 kilometers). If Earth were the nickel size, Jupiter would be as big as a basketball.

From an average distance of 484 million miles (778 million kilometers), Jupiter is 5.2 astronomical units away from the Sun. One astronomical unit (abbreviated as AU), equals the distance from the Sun to Earth. 

From this distance, it takes Sunlight 43 minutes to travel from the Sun to Jupiter.

Orbit and Rotation

Jupiter has the shortest day in the solar system. One day on Jupiter takes only about 10 hours (the time it takes for Jupiter to rotate or spin around once)

And it makes a complete orbit around the Sun (a year in Jovian time) in about 12 Earth years (4,333 Earth days).

Its equator is tilted with respect to its orbital path around the Sun by just 3 degrees. This means Jupiter spins nearly upright and does not have seasons as extreme as other planets do.

Potential for Life

Jupiter’s environment is probably not suitable to life as we know it. 

The temperatures, pressures, and materials that explains this planet are most likely too extreme and volatile for organisms to be adapted.

While planet Jupiter is not a suitable place for living things to take hold, the same is not true of some of its many moons. 

Europa is one of the places to find life elsewhere in our solar system. There is evidence of a large ocean beneath its icy crust, where life could possibly be nurtured.


With four large moons and many smaller moons, Jupiter forms a kind of miniature solar system in itself. 

Jupiter has total of 53 confirmed moons and 26 provisional moons awaiting confirmation of discovery. Moons are named after they are confirmed.

Jupiter’s four largest moons—Io, Europa, Ganymede, and Callisto—were first observed by the astronomer Galileo Galilei in 1610 using an early version of the telescope. 

These four moons are known today as the Galilean satellites, and they’re some of the most interesting destinations in our solar system. 

Io is the most volcanically active body in the solar system. 

Ganymede is the largest moon in the solar system (even bigger than the planet Mercury). 

Callisto’s very few small craters indicate a small degree of current surface activity. 

A liquid-water ocean with the ingredients for life may lie beneath the frozen crust of Europa, making it a tempting place to explore.


Discovered in 1979 by NASA’s Voyager 1 spacecraft, Jupiter’s rings were a surprise, as they are composed of small, dark particles and are difficult to see except when backlit by the Sun. 

Data from the Galileo spacecraft indicate that Jupiter’s ring system may be formed by dust kicked up as interplanetary meteoroids smash into the giant planet’s small innermost moons.


Jupiter took shape when the rest of the solar system formed about 4.5 billion years ago when gravity pulled swirling gas and dust in to become this gas giant. 

Jupiter took most of the mass left over after the formation of the Sun, ending up with more than twice the combined material of the other bodies in the solar system. 

In fact, Jupiter the largest planet has the same ingredients as a star, but it did not grow massive enough to ignite. About 4 billion years ago, Jupiter settled into its current position in the outer solar system, where it is the fifth planet from the Sun.


The composition of Jupiter the largest planet is similar to that of the Sun—mostly hydrogen and helium. 

Deep in the atmosphere, pressure and temperature increase, compressing the hydrogen gas into a liquid. This gives Jupiter the largest ocean in the solar system—an ocean made of hydrogen instead of water. 

There is a theory among scientists that says, at the planet’s center, the pressure becomes Huge. It is so great that it squeezes the electrons from the hydrogen atoms.  

Jupiter’s fast rotation drives electrical currents in this region. These electrical currents generate the planet’s powerful magnetic field. 

It is still unclear if, deeper down, Jupiter has a central core of solid material or if it may be a thick, super-hot and dense soup.

It could be up to 90,032 degrees Fahrenheit (50,000 degrees Celsius) down there, made mostly of iron and silicate minerals (similar to quartz).


As a gas giant, Jupiter the largest planet doesn’t have a true surface. The planet is mostly swirling gases and liquids. 

While a spacecraft would have nowhere to land on Jupiter, it wouldn’t be able to fly through unscathed either. 

The extreme pressures and temperatures deep inside the planet crush, melt and vaporize spacecraft trying to fly into the planet.


Jupiter’s appearance is a tapestry of colorful cloud bands and spots. The gas planet likely has three distinct cloud layers in its “skies” that, taken together, span about 44 miles (71 kilometers).

The top cloud is probably ammonia ice, while the middle layer is likely stocks ammonium hydrosulfide crystals. The innermost layer may consist of water ice and vapor.

The vivid colors you see in thick bands across Jupiter may be plumes of sulfur and phosphorus-containing gases rising from the planet’s warmer interior.

Jupiter’s fast rotation—spinning once every 10 hours—creates strong jet streams, separating its clouds into dark belts and bright zones across long stretches.

With no solid surface to slow them down, Jupiter’s spots can persist for many years. A dozen prevailing winds are sweeping the surface of stormy Jupiter. Some reaching up to 335 miles per hour (539 kilometers per hour) at the equator. 

The Great Red Spot, a swirling oval of clouds twice as wide as Earth, has been observed on the giant planet for more than 300 years. 

More recently, three smaller ovals merged to form the Little Red Spot, about half the size of its larger cousin. Scientists do not yet know if these ovals and planet-circling bands are shallow or deeply rooted in the interior.


Jupiter has a very powerful magnetic field that influences the space. We call it The Jovian Magnetosphere.

It balloons 600,000 to 2 million miles (1 to 3 million kilometers) toward the Sun (seven to 21 times the diameter or Jupiter itself).

It tapers into a tadpole-shaped tail extending more than 600 million miles (1 billion kilometers) behind Jupiter, as far as Saturn’s orbit.

Jupiter’s enormous magnetic field is 16 to 54 times as powerful as that of the Earth. It rotates with the planet and sweeps up particles that have an electric charge.

Near the planet, the magnetic field traps swarms of charged particles. This accelerates them to very high energies.

Energies creating intense radiation that bombards the innermost moons and can damage spacecraft.

Jupiter’s magnetic field also causes some of the solar system’s most spectacular aurorae at the planet’s poles.

Also Read–
Mercury – The Closest Planet to the Sun
Venus – The Twin Sister of Earth
Earth – Our Mother Land
Mars – The Red Planet

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