An Artistic Illustration Of Big Planet Jupiter with it's moon.
Image 1: An Artistic Illustration of Big Planet Jupiter with its moon. | Jupiter has a beautiful tapestry of colorful cloud bands and spots.

In 1979, Voyager Spacecrafts first took a close view of the planet Jupiter, Due to which we got to know a lot about the planet Jupiter. Then in 1989, with Galileo spacecraft, we came to know about Jupiter’s atmosphere, chemical composition, its moons, rings, gravity, magnetic field, and its patterns. After Galileo spacecraft, we found out what is in its core from Juno spacecraft in 2011, and whether it actually has a solid surface or not, it is also revealed that Jupiter is a giant planet of gas. Let’s know, Is Jupiter a failed star? And does it have any solid surfaces, or not? and more…


Is Jupiter a failed star?

Initial research of Jupiter

In 1979, when Voyager Spacecraft first took a close-up picture of the planet Jupiter. Since then, scientists have become more curious to know everything about Jupiter. So in 1989, the Galileo spacecraft was sent by NASA to get even closer to the planet Jupiter, which led us to know a lot about Jupiter, but due to the mission failure, we did not know about Jupiter’s surface and core.

Scientists wanted to know whether Jupiter has a solid surface like Earth or it is just a giant planet of gas. To know this, Juno spacecraft was sent in 2011, from the data collected by Juno spacecraft, we came to know that Jupiter does not really have any solid surface. The data collected by this mission proved that Jupiter is a giant planet of gas, and its chemical composition is similar to our Sun.

Chemical composition

Sun's Chemical Composition
Sun’s Chemical Composition Chart
Jupiter Chemical Composition
Jupiter’s Chemical Composition Chart

Now, because its chemical composition is similar to that of our Sun or a star, we can call Jupiter a failed star. Let us know this in more detail, from the data collected by Juno spacecraft we came to know that Jupiter is composed of mostly hydrogen and helium like other stars, and much less heavy elements. This means that the chemical composition of Jupiter is similar to that of a star, but it is not so heavy as a star that it can do fusion and radiate light.

Largest planet in the solar system

Jupiter is the largest and oldest planet in our solar system, with modern research scientists claim that it was formed almost 40 million years after the creation of the Sun, so about Jupiter’s Sun-like structure planets give us a lot of information, like how planets formed after the creation of the sun in our solar system.

Formation of Solar System

According to scientists, when a star is formed, all the gases and dust around it become a disk and start moving around the star, this disc is called the solar nebula. As huge clouds of dust and gas start moving around the star, due to gravity, all the heavy elements come near the stars, and the light elements are removed, due to gravity, all the elements collide and form planets. In which solid planets are formed from heavy elements and gases from light elements are formed.

Formation of Jupiter

Jupiter is also formed by collapsing similar light elements. But Jupiter could also become a complete star, or a planet entirely, or something different. For example, in our Milky Way Galaxy, there are many objects that are similar to Jupiter, their chemical composition is also similar, these objects are called Brown Dwarf. These things look very amazing.

Brown Dwarf objects like it or Jupiter all look the same, so they should be treated as starlight objects, not as a planet, although there are a lot of arguments among astronomers, as they are not yet definitive. We have not been able to know which name to use for Jupiter. They still have not been able to decide whether to call it a failed star or a planet.

Every planet is defined by its mass chemical composition and elements, and at least it is described as an object or mass, orbiting a star. Therefore, Jupiter is very much an object which cannot perform nuclear fusion. Therefore, we can neither call it a complete planet, nor a complete star. But as scientists get to know Jupiter and its similar planets more thoroughly, we will be able to understand the universe more closely, and to understand things like Jupiter better.

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Exploration and observation of Jupiter

For the exploration and observation of Jupiter, 9 spacecraft have been sent so far. Which includes four Flyby spacecraft, 3 gravity assist, and 2 orbiter.

Pioneer spacecraft

The Pioneer 10 spacecraft was first sent in 1972 for Jupiter’s observation. Whose mission was to take a picture of Jupiter and observe its magnetic field, then proceed to its second mission. Similarly, in 1973, Pioneer 11 was launched whose mission was to observe the asteroid belt of Jupiter and its surroundings then proceed to observe Saturn and cosmic rays. With the help of Pioneer missions, we were able to know a lot about Jupiter in which the biggest discovery is Jupiter’s magnetosphere.

Voyager Spacecraft

Then in 1979 Voyager 1 and Voyager 2 were sent for the observations of Jupiter’s ring system and its lunar IO and Europa.

Ulysses Spacecraft

Ulysses Spacecraft was sent by NASA in 1992 for a detailed study of the gravity and atmosphere of Jupiter after the Pioneer and Voyager missions.

Cassini and New Horizons

Then in 2000 Cassini spacecraft then in 2007, New Horizons spacecraft sent Pioneer 10, 11 Voyager 1, 2, Ulysses, Cassini, and New Horizons with the help of all these spacecraft we got to know Jupiter’s outer atmosphere, gravity, and magnetosphere.

Galileo spacecraft

Jupiter was ranked number one in the Planetary Science Decadal Survey published in 1968. So after the Voyager mission, scientists were very curious about Jupiter. They wanted to know the atmosphere of Jupiter and whether Jupiter has a solid surface or not.

To know this they sent the Galileo spacecraft in 1989, by 1995, after 6 years of travel and 58 million kilometers away from us, Galileo had reached into Orbit of Jupiter. Galileo spacecraft had two parts, the first Jupiter atmospheric probe i.e., lander, and the second part was the orbiter, which had to deliver the data deposited by the lander to Earth by staying in Jupiter’s orbit.

The lander had to study Jupiter’s magnetic field and gravity closely. And thus on 7 December 1995, the Jupiter atmospheric probe, i.e., lander, made of titanium, detached from the Galileo spacecraft and entered inside Jupiter in a short time. The powerful gravity of Jupiter at a speed of about one lakh 62 thousand per hour, had been pulling the lander, scientists opened the parachute on it to reduce the speed of the lander. Shortly after the parachute opened it reached the atmosphere of Jupiter. From where it was continuously sending all the information to the orbiter, and the orbiter sending data on Earth. We were getting information from the lander and orbiter which we did not know before.

Jupiter’s atmosphere

After lander reached the highest atmosphere of the Jupiter, we came to know that Jupiter’s upper atmosphere is not like Earth’s atmosphere, but full of dense clouds, Clouds that are of different sizes. The atmosphere here is like a dense smoke chamber which looks very strange indeed. Jupiter’s clouds consist of ammonia hydrogen sulfide and water.
We also came to know from the presence of water that there is rain on Jupiter, but the temperature is so high that the rainwater becomes steamy, and cannot reach the surface in a little depth after this dense cloud. The upper clouds dissipate as we go, and an empty sky comes, at this place we came to know that the depth and temperature of Jupiter keeps increasing, the higher the temperature and pressure.

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In this empty sky, most of the rainwater evaporates again and goes into the upper atmosphere, even after going to a depth of about 156 kilometers, the lander did not find any solid surface. Lander lost control. After the signal was closed, the lander melted and evaporated due to the inhalation temperature and pressure.

Although the lander could not go much deeper than this, yet it told us a lot about Jupiter’s atmosphere. From the Galileo mission, we also came to know that Jupiter’s ring system is made of the dust of the collision of the four moons. It also helped us understand Jupiter’s magnetosphere in a better way. After 14 years in space and 8 years in the Jovian system, the orbiter of Galileo was destroyed by sending it to Jupiter’s atmosphere so that Jupiter’s moon would not be contaminated by bacteria from the Earth.

Juno Spacecraft

After the Galileo mission, scientists wanted to know more than this, we were not yet able to know whether there is a solid surface on Jupiter or not, so in 2011 we sent Juno Spacecraft whose main job was to know Jupiter’s composition, gravity fields, magnetic fields, polar magnetic fields, and core. On July 5, 2016, Juno Spacecraft successfully reached Jupiter’s orbit. With the help of Juno Spacecraft, we got closer to Jupiter, Juno did not have any lander like Galileo, it is just to study Jupiter by staying in Jupiter’s orbit.

Liquid core of Jupiter

From the data sent by Juno, we came to know that Jupiter does not actually have a solid surface, but it has a liquid core in the middle, which has a temperature of about 9700 degrees Celsius. The pressure here is so high that the atoms of hydrogen change from the normal to a liquid state called metallic hydrogen.

This form of hydrogen acts like an electric conductor, so it is due to this liquid core that Jupiter’s huge magnetosphere is formed. Juno has proved that Jupiter is a giant planet of gas, whose chemical composition is similar to that of a star, Jupiter’s chemical composition is similar to that of a star, leading some scientists to believe that Jupiter is actually a failed star. Juno is still studying Jupiter by staying in Jupiter’s orbit.

Jupiter’s future missions

Even after knowing so much about Jupiter, scientists believe that we still have a lot to know about Jupiter. The European Space Agency has therefore chosen the L1-class juice mission to explore Jupiter’s Galilean moons as part of its cosmic vision program, with a mission provided by Roskosmos in 2022. Similarly, ISRO will also launch the first Indian mission to Jupiter in 2022 or 2023 via Geosynchronous Satellite Launch Vehicle Mark 3. After a long halt and a suborbital test flight, ISRO successfully launched the first geosynchronous satellite launch vehicle mark 3 i.e., Gslv-3 from Satish Dhawan Space Center on 5 June 2017. In 2022, a human will be sent into space by a low earth orbit spacecraft called Gaganyaan and GSLV3 rockets will be used in this mission.


This Article was Published On: 10 August, 2019 And Last Modified On: 8 November, 2020

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