In the vast reaches of our solar system, Jupiter reigns supreme as a gigantic mystery, captivating
scientists and astronomers for centuries.
Just when we think we understand the gas giant, this celestial behemoth shatters our assumptions.
With its blend of unpredictable and often hostile behavior, mesmerizing storms with
winds of up to 640 kilometers per hour [400 miles per hour] and the enshrouded mysteries
of concealed metallic oceans within its core, Jupiter still leaves scientists puzzled.
Join us on an extraordinary journey as we delve into the depths of this enigmatic world,
uncovering its secrets.
[LOGO]
Decades of extensive studies have demonstrated just how remarkably intricate Jupiter is.
Just recently, 12 more moons orbiting the gas giant have been discovered.
The total number of satellites around Jupiter is now 92, more than any other planet in the
solar system.
The latest moons discovered have sizes ranging from 1-3.2 kilometers [0.6-2 miles].
A majority of these moons have extensive orbits, with 9 out of 12 taking over 550 days to complete
one revolution around the planet.
Scientists believe that because these distant moons move in the opposite direction of Jupiter's
rotation, they could be captured asteroids.
It's been widely believed that Jupiter acts as a protective shield, safeguarding our planet
from threats from outer space.
In the past, astronomers have even suggested that this was one of the reasons life got
a chance at evolving on Earth.
But recent findings cast doubt on Jupiter's role as Earth's celestial guardian.
Long-period comets, which originate from the distant regions of the solar system and take
millenia to orbit the Sun, typically enter our vicinity.
However, thanks to Jupiter's gravitational influence, most of these swiftly moving icy
objects are flung away from the solar system before approaching Earth.
So the chances of long-period comets colliding with our planet are extremely rare, occurring
over millions or even tens of millions of years, and Jupiter's presence plays a crucial
role in shielding Earth from these potential impacts.
However, the gas giant's gravitational forces have both positive and negative implications
for life on Earth.
On one hand, its immense gravity prevents nearby space rocks from accumulating and forming
into a planet.
This led to the formation of the asteroid belt — a collection of numerous small debris
fragments scattered between Mars and Jupiter.
But nowadays, the gas giant’s gravitational pull continues to influence asteroids, causing
some to deviate toward the sun.
This change in their trajectory increases the odds of collisions with Earth, and we’ve
already witnessed it in the past.
In 1770, Lexell’s Comet passed just about a million miles away from our planet — an
extraordinary proximity on an astronomical scale.
Scientists believe that this comet had initially come from the outer reaches of the solar system,
and had a close encounter with Jupiter that redirected its path towards Earth.
After completing two orbits around the sun, the comet returned to a point of close proximity
to Jupiter nine years later, which subsequently ejected it from the solar system.
The Jupiter shield theory, supported by previous computer simulations, suggested that the gas
giant ejects countless long period comets out of the solar system.
And this theory even predicted the comet Shoemaker–Levy 9 striking the fifth planet in 1994.
But computing resources weren’t as powerful as they are nowadays and scientists had to
make a lot of calculations.
Today, we have data that includes a greater number of short-period comets and near-Earth
asteroids that intersect with Earth's orbit compared to long-period comets.
And new simulations demonstrate a different picture.
Jupiter's influential gravity interacts with the Asteroid Belt, causing gravitational resonances
that clear out rogue asteroids and redirect them inward.
Collisions between asteroids can also contribute to this process by dispersing rocky fragments
into resonant zones.
The inner edge of the asteroid belt is particularly affected by a phenomenon known as secular
resonance, which drives material into the inner solar system.
Jupiter's current mass allows it to both redirect comets towards Earth, as seen with Lexell's
Comet, and effectively remove them from the solar system.
If Jupiter had only one-fifth of its current mass, it would still destabilize comets, but
lose the ability to remove many of them, leading to a higher impact rate on Earth.
The frequency of impacts plays a crucial role in the long-term evolution of life on a planet.
Earth's geological record indicates that an impact rate of one major collision every hundred
million years provides enough time for the biosphere to recover and thrive.
However, a higher impact rate occurring every few million years could devastate the planet,
hindering the development of a new biosphere.
Some scientists believe collisions with Earth is also how water was brought here.
But what about water on Jupiter?
Water vapor was first detected on Jupiter in 1995.
This discovery was made by the Galileo spacecraft, which conducted extensive observations and
measurements of the planet and its moons.
The onboard instruments of the Galileo spacecraft, particularly the Near-Infrared Mapping Spectrometer,
detected the presence of water vapor in the planet's atmosphere during its close flyby.
But recent data demonstrates water makes up approximately 0.25% of Jupiter’s atmosphere
above the planet’s equator.
While this may not sound like a lot, it’s actually an immense amount of water.
Jupiter, probably the first planet to form in our solar system, contains a significant
amount of gas and dust that didn’t become part of the Sun.
Knowing just how much water is locked up in Jupiter is crucial for scientists studying
the formation of the solar system.
In recent years, a team of researchers used telescope data to discover a substantial presence
of water within Jupiter's famous Great Red Spot.
Launched by NASA in 2012, the Juno spacecraft currently orbits the gas giant, taking close-up
pictures of its clouds.
Equipped with advanced instruments, the spacecraft has now revealed even more evidence of water
on Jupiter.
Because this massive gas giant holds more than double the combined mass of all the other
planets in our solar system, even small fractions of water on such a massive planet would amount
to a significant quantity — far exceeding the amount of water found on Earth.
Water in the gas giant’s atmosphere is also the reason why Jupiter, just like Earth, has
its own mesmerizing displays of lightning a hundred times brighter than terrestrial
lightning and peculiar hailstones.
Lightning has been detected in the planet’s water clouds in the past, where water droplets
collide with electrically charged ice crystals.
But the Juno spacecraft has also spotted dim lightning at higher altitudes in the atmosphere,
where the temperatures drop to approximately -87°C [-125°F] - too frigid for water to
exist in its liquid state.
So how does lightning happen under such conditions?
The answer to the mystery lies in ammonia, a remarkable component in Jupiter's atmosphere
that serves as a natural antifreeze.
In the upper atmosphere, water ice crystals combine with ammonia vapors and melt.
These water-ammonia droplets then collide with additional ice crystals from below, creating
an electrical charge that generates lightning.
Below the ammonia ice clouds, the ammonia-water droplets undergo continuous growth until they
become too heavy to remain suspended in the air, and resemble large hailstones like we
have on Earth.
Scientists believe that these mushball-like objects descend deeper into Jupiter's atmosphere.
But now, let’s travel even deeper into Jupiter’s innermost layers.
Previously, it was believed that our solar system's giant worlds all have a rocky core.
This was the accepted theory for a very long time, but recently, scientists have started
to doubt this theory.
Using Juno's orbit data, scientists are still studying how matter is distributed inside
Jupiter, and recent discoveries have unveiled an unexpected mystery lurking within the gas
giant’s core.
Jupiter's core has extremely high pressures, much greater than on Earth, and temperatures
as hot as 20,000°C [36,000°F].
To understand these conditions, scientists use powerful lasers to compress samples and
mimic the planet’s pressures in a laboratory.
The Center for Matter at Atomic Pressures [CMAP] at the University of Rochester is at
the forefront of this research.
The density of materials in Jupiter's core depends on their composition and physical
properties.
And just recently, scientists have discovered that Jupiter's core is not as compact as they
thought it was.
Deep within its inner regions, only 18% of the material is rocky.
Jupiter is predominantly made up of hydrogen, accounting for about 90% of its composition,
along with roughly 10% helium and trace amounts of other elements.
In the outer layers of this gas giant, hydrogen exists as a colorless and transparent gas,
in the same form as it exists here on our planet.
As you descend deeper into Jupiter, the increasing atmospheric pressure transforms hydrogen into
a bizarre, dense fluid that conducts like a metal.
So what is this substance?
Approximately 10% of the way towards Jupiter's core, along its radius, the immense volume
of hydrogen gas that forms the planet's atmosphere becomes compressed into a unique form known
as liquid metal hydrogen.
Liquid metallic hydrogen possesses properties similar to water, with low viscosity, excellent
electrical conductivity, and efficient thermal conduction.
Within Jupiter, this abundant substance transforms the planet into one huge generator.
On Earth, elements exist as solids, liquids, or gasses, depending on temperature and pressure.
While hydrogen is typically a gas on our planet, it can be compressed and cooled artificially
to become a liquid or solid.
However, even in these states, hydrogen retains its non-metallic nature, poorly conducting
heat and electricity.
In contrast, metals excel at conducting heat and electricity due to their atom arrangement.
Deep within the gas giants of our solar system, hydrogen undergoes extreme temperature and
pressure, which allow for peculiar states including liquid metallic hydrogen.
Hydrogen atoms, under these conditions, shed their electrons, resulting in a mix of free-floating
hydrogen nuclei and electrons.
This electron mobility resembles metal behavior.
There’s a theory that Jupiter's core might be filled with vast oceans of this substance,
and based on previous estimations of the Jovian core's mass, it could be 12 to 45 times more
massive than our planet.
A 40,000 kilometer [25,000 mile] deep layer of liquid metallic hydrogen, combined with
Jupiter's rapid rotation of about 10 hours, generates a colossal magnetic field that spans
an astonishing distance of 725 million kilometers [450 million miles].
This magnetic field stands as the largest in our solar system, and it contains mysteries
of its own.
Exploring regions more than 320 kilometers [200 miles] down into Jupiter’s atmosphere,
scientists have identified a newfound area known as the Great Blue Spot, not to be confused
with Jupiter's Great Red Eye storm.
Researchers knew that the Jovian magnetic field was complex, but they had no idea just
how weird it was, and it has something to do with the Great Blue Spot.
The Jovian magnetic field is 20,000 times stronger than the Earth’s magnetic field.
But now scientists have discovered that its strength is volatile.
Unlike the Earth’s dipolar magnetic field, the gas giant's magnetic field originates
from a wide area in the northern hemisphere and re-enters near the south pole.
Researchers have also identified a concentrated region just south of the equator - the Great
Blue Spot.
In a way, this area is like a second Jovian south pole located near the equator.
The colossal storm that has raged for centuries is probably caused by the presence of high
concentrations of ammonia in the atmosphere.
The intensity of the magnetic fields in the Great Blue Spot undergoes fluctuations of
up to one percent per year, strengthening and weakening across different regions.
By the end of the extended Juno mission in 2025, scientists will have ample evidence
to evaluate their hypothesis.
As research continues, we're going to encounter new mysteries about the gas giant.
Since the Great Blue Spot and the Great Red Spot are located at the same latitude, it’s
possible the two phenomena are somehow connected.
Gas giants are typically characterized by their high temperatures, especially in their
upper atmospheres.
In our solar system, there are two such giants - Saturn and Jupiter.
However, Jupiter doesn’t have a consistently high temperature throughout its entire structure.
The solar system’s largest planet is mostly known for its massive storm twice the size
of Earth - the Great Red Spot, but the gas giant has other spots too.
The Great Cold Spot is nearly as large, and scientists have been observing this phenomenon
for years now.
At its largest, the spot is approximately 12,000 by 24,000 kilometers [7,500 by 15,000
miles] across.
But unlike the famous Red Spot, this intriguing atmospheric feature stands out as a region
of significantly colder temperatures compared to its surroundings, about 200°C [400°F]
cooler than the surrounding atmosphere.
The Great Cold Spot is volatile, disappearing and reappearing from time to time.
Scientists have discovered that the phenomenon’s recurrence is triggered by the planet’s
auroras.
Because of this correlation, the spot’s age is about the same as the age of Jupiter’s
polar lights, which is in thousands of years.
Jupiter's auroras, similar to Earth's, are produced by charged particles interacting
with the planet's atmosphere near the poles.
However, the gas giant’s polar lights are more stable and intense as they receive particles
from both its moons and the Sun.
New findings indicate that these auroras transfer energy to Jupiter's atmosphere, creating a
temperature difference between the upper and lower regions.
This temperature contrast leads to the formation of a swirling vortex, resulting in a cooler
patch that is distinct from the aurora and its surroundings.
Earth also experiences similar effects.
However, the combination of factors, like Jupiter's rotation that helps retain heat
in specific areas and the varying nature of these events, makes the occurrence of polar
lights on our planet less consistent.
Another discovery made about the gas giant was that, contrary to common belief, Jupier
doesn’t actually orbit the sun.
The center of gravity between Jupiter and the Sun does not reside within the Sun itself
but instead exists at a specific point just above the Sun's surface.
In space, when a smaller object seemingly orbits a larger one, both objects actually
orbit around a combined center of gravity.
Consider Earth and the Sun, for instance.
In this case, the center of gravity is so close to the center of the larger object that
its impact is hardly noticeable.
The larger object appears motionless, while the smaller object traces a seemingly perfect
circular path around it.
The same happens when the International Space Station orbits the Earth.
Both the Earth and the ISS orbit around their shared center of gravity, even though our
planet seems to be completely stationary while the ISS appears to orbit the Earth in perfect
circles.
This principle generally holds true for most planets in our solar system.
Even Saturn has negligible influence on the Sun's position in space.
However, as the difference in mass between the two objects decreases, everything changes.
In the case of Jupiter, its immense size causes the center of mass, known as the barycenter,
to exist 1.07 solar radii away from the Sun's center, approximately 7% of a solar radius
above the Sun's surface.
This means that both the Sun and Jupiter orbit around this particular point in space.
As the voyage of discovery continues, the enigmatic depths of Jupiter hold even more
surprises yet to be unveiled.
Stay tuned here to be the first to witness cosmic newfound wonders, and thanks for watching!