NASA: Indications of water on Jupiter

How a NASA Scientist Looks in the Depths of the Great Red Spot to Find Water on Jupiter

For centuries, scientists have worked to understand the makeup of Jupiter. It’s no wonder: this mysterious planet is the biggest one in our solar system by far, and chemically, the closest relative to the Sun. Understanding Jupiter is key to learning more about how our solar system formed, and even about how other solar systems develop.

But one critical question has bedeviled astronomers for generations: Is there water deep in Jupiter’s atmosphere, and if so, how much?

Gordon L. Bjoraker, an astrophysicist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, reported in a recent paper in the Astronomical Journal that he and his team have brought the Jovian research community closer to the answer.

By looking from ground-based telescopes at wavelengths sensitive to thermal radiation leaking from the depths of Jupiter’s persistent storm, the Great Red Spot, they detected the chemical signatures of water above the planet’s deepest clouds. The pressure of the water, the researchers concluded, combined with their measurements of another oxygen-bearing gas, carbon monoxide, imply that Jupiter has 2 to 9 times more oxygen than the Sun. This finding supports theoretical and computer-simulation models that have predicted abundant water (H2O) on Jupiter made of oxygen (O) tied up with molecular hydrogen (H2).

This video animation above takes the viewer on a simulated flight into, and then out of, Jupiter’s upper atmosphere at the location of the Great Red Spot. It was created by combining an image from the JunoCam imager on NASA’s Juno spacecraft with a computer-generated animation. The perspective begins about 2,000 miles (3,000 kilometers) above the cloud tops of the planet’s southern hemisphere. The bar at far left indicates altitude during the quick descent; a second gauge next to that depicts the dramatic increase in temperature that occurs as the perspective dives deeper down. The clouds turn crimson as the perspective passes through the Great Red Spot. Finally, the view ascends out of the spot.
Credits: NASA/JPL

The revelation was stirring given that the team’s experiment could have easily failed. The Great Red Spot is full of dense clouds, which makes it hard for electromagnetic energy to escape and teach astronomers anything about the chemistry within.

“It turns out they’re not so thick that they block our ability to see deeply,” said Bjoraker. “That’s been a pleasant surprise.”

New spectroscopic technology and sheer curiosity gave the team a boost in peering deep inside Jupiter, which has an atmosphere thousands of miles deep, Bjoraker said: “We thought, well, let’s just see what’s out there.”

The data Bjoraker and his team collected will supplement the information NASA’s Juno spacecraft is gathering as it circles the planet from north to south once every 53 days.

Among other things, Juno is looking for water with its own infrared spectrometer and with a microwave radiometer that can probe deeper than anyone has seen — to 100 bars, or 100 times the atmospheric pressure at Earth’s surface. (Altitude on Jupiter is measured in bars, which represent atmospheric pressure, since the planet does not have a surface, like Earth, from which to measure elevation.)

If Juno returns similar water findings, thereby backing Bjoraker’s ground-based technique, it could open a new window into solving the water problem, said Goddard’s Amy Simon, a planetary atmospheres expert.

“If it works, then maybe we can apply it elsewhere, like Saturn, Uranus or Neptune, where we don’t have a Juno,” she said.

Juno is the latest spacecraft tasked with finding water, likely in gas form, on this giant gaseous planet.

Water is a significant and abundant molecule in our solar system. It spawned life on Earth and now lubricates many of its most essential processes, including weather. It’s a critical factor in Jupiter’s turbulent weather, too, and in determining whether the planet has a core made of rock and ice.

Jupiter is thought to be the first planet to have formed by siphoning the elements left over from the formation of the Sun as our star coalesced from an amorphous nebula into the fiery ball of gases we see today. A widely accepted theory until several decades ago was that Jupiter was identical in composition to the Sun; a ball of hydrogen with a hint of helium — all gas, no core.

But evidence is mounting that Jupiter has a core, possibly 10 times Earth’s mass. Spacecraft that previously visited the planet found chemical evidence that it formed a core of rock and water ice before it mixed with gases from the solar nebula to make its atmosphere. The way Jupiter’s gravity tugs on Juno also supports this theory. There’s even lightning and thunder on the planet, phenomena fueled by moisture.

“The moons that orbit Jupiter are mostly water ice, so the whole neighborhood has plenty of water,” said Bjoraker. “Why wouldn’t the planet — which is this huge gravity well, where everything falls into it — be water rich, too?”

The water question has stumped planetary scientists; virtually every time evidence of H2O materializes, something happens to put them off the scent. A favorite example among Jupiter experts is NASA’s Galileo spacecraft, which dropped a probe into the atmosphere in 1995 that wound up in an unusually dry region. “It’s like sending a probe to Earth, landing in the Mojave Desert, and concluding the Earth is dry,” pointed out Bjoraker.

In their search for water, Bjoraker and his team used radiation data collected from the summit of Maunakea in Hawaii in 2017. They relied on the most sensitive infrared telescope on Earth at the W.M. Keck Observatory, and also on a new instrument that can detect a wider range of gases at the NASA Infrared Telescope Facility.

infrared image of jupiter

The Great Red Spot is the dark patch in the middle of this infrared image of Jupiter. It is dark due to the thick clouds that block thermal radiation. The yellow strip denotes the portion of the Great Red Spot used in astrophysicist Gordon L. Bjoraker’s analysis. Credits: NASA’s Goddard Space Flight Center/Gordon Bjoraker

The idea was to analyze the light energy emitted through Jupiter’s clouds in order to identify the altitudes of its cloud layers. This would help the scientists determine temperature and other conditions that influence the types of gases that can survive in those regions.

Planetary atmosphere experts expect that there are three cloud layers on Jupiter: a lower layer made of water ice and liquid water, a middle one made of ammonia and sulfur, and an upper layer made of ammonia.

To confirm this through ground-based observations, Bjoraker’s team looked at wavelengths in the infrared range of light where most gases don’t absorb heat, allowing chemical signatures to leak out. Specifically, they analyzed the absorption patterns of a form of methane gas. Because Jupiter is too warm for methane to freeze, its abundance should not change from one place to another on the planet.

“If you see that the strength of methane lines vary from inside to outside of the Great Red Spot, it’s not because there’s more methane here than there,” said Bjoraker, “it’s because there are thicker, deep clouds that are blocking the radiation in the Great Red Spot.”

Bjoraker’s team found evidence for the three cloud layers in the Great Red Spot, supporting earlier models. The deepest cloud layer is at 5 bars, the team concluded, right where the temperature reaches the freezing point for water, said Bjoraker, “so I say that we very likely found a water cloud.” The location of the water cloud, plus the amount of carbon monoxide that the researchers identified on Jupiter, confirms that Jupiter is rich in oxygen and, thus, water.

Bjoraker’s technique now needs to be tested on other parts of Jupiter to get a full picture of global water abundance, and his data squared with Juno’s findings.

“Jupiter’s water abundance will tell us a lot about how the giant planet formed, but only if we can figure out how much water there is in the entire planet,” said Steven M. Levin, a Juno project scientist at NASA’s Jet Propulsion Laboratory in Pasadena, California.

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23 thoughts on “NASA: Indications of water on Jupiter

  1. Aren’t the gas giants supposed to be just gas balls with no solid surface? In which case, there can’t be water “or anything else ON Jupiter, it would have to be IN Jupiter.

    • Did you read the article? Here’s the relevant section:

      A widely accepted theory until several decades ago was that Jupiter was identical in composition to the Sun; a ball of hydrogen with a hint of helium — all gas, no core.

      But evidence is mounting that Jupiter has a core, possibly 10 times Earth’s mass. Spacecraft that previously visited the planet found chemical evidence that it formed a core of rock and water ice before it mixed with gases from the solar nebula to make its atmosphere.”

    • Don’t know about Jupiter but this is what i found about our other gas giant, saturn. “Although Saturn is cold on the outside and has a top layer of ammonia ice crystals, the innermost core is around 22,000 degrees. According to research by NASA, Saturn most likely has a rocky core about the size of earth”

    • The densities of the gas giants are rather telling:
      Jupiter is 1.326 g/cm^3;
      Saturn is 0.687 g/cm^3;
      Uranus is 1.27 g/cm^3; and
      Neptune is 1.638 g/cm^3.

      An object with the density of Saturn would float in water.

      The rocky planets have densities more than 5 g/cm^3–with the exception of Mars which is 3.933 g/cm^3.

      Jim

    • The solid part of Jupiter was quite evident when comet Shoemaker-Levy impacted in 2009. The impact kicked up debris into the outer atmosphere and left dark patches where it impacted.
      Yes, Jupiter has a surface, which has been known for some time. And, it is only a matter of semantics as to what constitutes a planet and its physical entity.

      You should have stopped at your first question instead of trying to answer it yourself.

      • Shoemaker-Levy’s fragments evaporated a long time before they reached any solid or quazi-solid surface.

  2. If water was brought to Earth by comets and asteroids etc, then Jupiter must have an order of magnitude more water on it compared to that on Earth in view of its much greater gravitational pull and its position in the Solar system

  3. Did anyone else find this sentence somewhat jarring: “This finding supports theoretical and computer-simulation models that have predicted abundant water (H2O) on Jupiter made of oxygen (O) tied up with molecular hydrogen (H2).” They could have just put a period after ‘Jupiter’ and been done with it, no?

    • Press releases are usually not written by the scientists themselves.
      Probably written by some communications or journalism Liberal Arts degree major trying to sound sciency.

      That ending to the sentence implies that H2O bonding looks like:
      O-H-H , rather than H-O-H. Clearly rather ridiculous wording that didn’t come from a scientist.

      • Press releases are usually not written by the scientists themselves.
        Probably written by some communications or journalism Liberal Arts degree major trying to sound sciency.

        That ending to the sentence implies that H2O bonding looks like:
        O-H-H , rather than H-O-H. Clearly rather ridiculous wording that didn’t come from a scientist.

        Doesn’t matter who “wrote” the error.
        “IF” – Big IF there! – the “scientist” who being praised and promoted BY the publicity and press releases does NOT check the work and CORRECT immediately any errors or omissions or “scientific” facts or predictions, then he or she is immediately responsible for the words praising her accomplishments and that instituion’s press release.

  4. I thought this “no water” on Jupiter had been resolved. I remember reading about observing thunderstorms the size of the United States on Jupiter. That would imply a lot of water. Of course, there’s lightning everywhere. As it left, one of the Voyager image-sequences (maybe both Voyagers) observed numerous lightning flashes on the unlit side of Jupiter.

    Jim

    • The Galileo probe carried a lightning detector, and detected almost none in its vicinity. It also detected about half the amount of helium and less water than expected. It had the dumb luck to hit a hot spot in the atmosphere, and the temperature at loss of signal was over 150 C.

      • They should’ve sent dozens and dozens of probes into Jupiter. One probe does not a planet make, and Jupiter is a very, very, very large planet.

        Jim

  5. They modeled Jupiter’s atmosphere then tried to prove the model right through physical experiments/observations? That’s not how science is done! /sarc

  6. There is oxygen on the sun and Jupiter and enormous amounts of hydrogen. Oxygen wouldn’t have a problem finding its favorite partner nearby. Let me take the pressure of these guys. Yeah there is water on Jupiter and all the moons and planets. They even get hit with ice comets occasionally.

  7. Someone should point out to these yahoos that Europa, the smallest of Jupiter’s four big moons clearly has a deep ocean of water (probably brine) across its entire surface of frozen ice.

    And then there’s Jupiter’s big boy Ganymede, which may have more water than the Earth under its frozen surface.

  8. Water, by Jove! Thought that the presence of water was taken for granted. Much more interesting is the temperature vs pressure relationship of the Jovian atmosphere.

  9. It is highly expected and probable that Jupiter has lots of water. If the solar system while forming didn’t have a Jupiter to take out the “excess”, we might be in a water world here.

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