What would happen if Jupiter hit Earth [Video]

What would happen if a rocky planet the size of Earth collided with Jupiter? originally appeared on Quora: the knowledge sharing network where compelling questions are answered by people with unique insights.

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Answer by Joe Buettner, on Quora:

Never underestimate high-energy collisions. On March 24, 1993, Comet Shoemaker–Levy 9 was found in a decaying orbit around Jupiter.

The comet had entered Jupiter’s roche limit and fragmented into 21 pieces up to 2 kilometers (1.2 miles) in diameter.

During July of 1994 the fragments impacted Jupiter at speeds of roughly 60 kilometers per second (37 miles per second).



The results were impressive and unexpected:

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Impact marks strung across Jupiter’s surface from the nearly week long impact event. (Image:… [+] Wikipedia)

Impact marks strung across Jupiter’s surface from the nearly week long impact event. (Image:… [+]

Those impact marks were quite easily visible, even using small telescopes. The first impact, on July 16, left a mark about 6,000 kilometers (3,700 miles) across, roughly the radius of Earth.

The fireball caused by the impact reached a maximum temperature of 24,000 Kelvin (23,726.85 Celsius or 42,740.33 Fahrenheit). By contrast, Jupiter’s regular cloud temperature is roughly 130 Kelvin (-143.15 Celsius or -225.67 Fahrenheit).

The fireball plume reached over 3,000 kilometers (1864 miles) high.


The largest impact was the seventh, Fragment G, which left a mark approximately 12,000 kilometers (7,456.45) across.

Fragment G was estimated to have released the equivalent of 6,000,000 megatons of TNT in energy.

If that energy figure feels meaningless just think of it as 600 times more powerful than Earth’s entire nuclear arsenal. The biggest single bomb we ever tested was 50 megatons.

The scars on Jupiter’s observable surface were visible for months after the Shoemaker-Levy 9 impacts.

That was our first real experience observing major impacts on celestial bodies … and all those fragments were 2 kilometers in diameter or less and not terribly dense.

Earth has an average radius of 6,371 kilometers (3,958.8 miles) and a density of 5.514 grams per milliliter. If something that big and dense quickly entered Jupiter’s roche radius and proceeded to impact Jupiter …

we honestly don’t know exactly what would happen. Our observations of the solar system are based mostly upon its unusual stability within our frame of reference.

Even events like the Shoemaker-Levy 9 impacts are relatively stable; it was over a year from the time we discovered the fragmented comet before it impacted Jupiter.

In that year we drew up lots of predictive models. Very few of them ended up being right.

We had no frame of reference because that was the first time we saw impact events of that magnitude.

The impact of an earth sized object would similarly be outside of our frame of reference because we’ve never observed and recorded such an occurrence.

It’s a fair bet that pieces of the impacting planet would break up, but how much it would break up would depend on variables that we can’t simulate.

It’s fair to say that Jupiter’s atmosphere would be heated a fair amount and become brighter, but by how much we really don’t know. We can be pretty sure that some of the broken up material before impact would form a ring around Jupiter.



It’s also possible that if enough ejecta was released, some of that material might form a ring around Jupiter too. Given the energy involved in the collisions, Jupiter’s axis, rotation and orbit might be affected, but we have no way of determining by how much.

Really, there are only two things we can be certain about. First, if a rocky planet the size of Earth collided with Jupiter, our system’s largest gas giant would look very different.

Second, the scientific community would learn a lot more about Jupiter and celestial impact events.

Is Jupiter a friendly planet, Earth’s enemy, or perhaps both?

For decades, scientists have talked about how the giant gas planet keeps some asteroids from striking our small world, while others have pointed out that Jupiter’s gravity could send some civilization-shattering asteroids our way.

While that debate goes on, a subtler question arises about how influential Jupiter was in the early Solar System. Jupiter is by far the heavyweight planet in the Solar System, weighing in at 320 Earth masses.

Its gravity not only influences small asteroids that go by, but also tugs on other planets in the solar system — including our own.

What if Jupiter had had a more eccentric orbit?

Could that have affected the habitability of Earth? A new peer-reviewed study published on preprint site Arxiv, called “The role of Jupiter in driving Earth’s orbital evolution,” examines these questions in more detail.

It was presented at the Australian Space Science Conference.

At first blush it appears Jupiter’s position in the Solar System could vary greatly without hurting life’s beginnings as we know it, but more studies of how other planets influence Earth’s climate are needed before we can better understand what’s going on, the researchers said.

Depending on how Jupiter interacts with Earth in different scenarios, Earth’s orbit could vary dramatically, thereby influencing the amount of sun we receive on the surface.

Once we begin to figure out the ranges of habitability in the models, this could help us narrow the search for other habitable planets outside the Solar System that have gas giants nearby.

Life-friendly scenarios

Surveys with NASA’s Kepler space telescope and other observatories reveal one great truth about planets: they tend to form in groups. Most planets outside the solar system are found with companions.

We’ve also seen an array of planetary systems, including those where gas giants known as “Hot Jupiters” are close to their parent star.

The search for habitability is often focused on finding rocky planets or moons similar in size to the Earth, and ones orbiting at the right distance from a star to make liquid water possible.

However, other factors include the variability of a planet’s orbit, or the tilt of its poles, both of which could be influenced by bigger planets in that planet’s solar system.



Researchers got interested in the effects of nearby planets on life after observing the Moon.

“I started looking at the effects of the Moon on Earth’s climate,” said University of London geologist David Waltham, a co-author of the study. “It’s often said the moon stabilizes the Earth’s axis.

It’s wrong. It actually nearly destabilizes the axis.”

Certainly, if you suddenly took the Moon away, the Earth’s axis would destabilize. But Waltham said the better question is to ask what would happen if there was a larger moon from the beginning.

The solar system to scale. The diameter of Jupiter (middle, with red spot) is about 11 times that of Earth (third planet from the left). Credit: Lunar and Planetary Institute

“Any initially stable planet will eventually become unstable as its spin slows but, without a moon, this could take tens or hundreds of billions of years,” Waltham said.

“Having a moon increases the rate with which the spin slows so that, in Earth’s case for example, it will only take 6 billion years (from formation) for the Earth’s axis to become unstable.”

In a nutshell, taking the Moon away today is not the same thing as not having a Moon in the first place. We’ve had 4.5 billion years of lunar-generated spin-deceleration.

From there, Waltham began considering scenarios where moons would not destabilize a planet as quickly. One of them would be if the solar system was precessing, or moving, more slowly.

This led him to wonder about the influence of other planets on Earth, a question also preoccupying Jonti Horner, an astronomer and astrobiologist at the University of Southern Queensland, who is affiliated with the Australian Centre for Astrobiology.

Jupiter on the move

The researchers ran models of our Solar System. With each iteration, seven of the eight planets in the solar system are in the same starting conditions in terms of mass, location and orbit.

The eighth, Jupiter, kept the same mass but was moved around in various ways.

The researchers used different orbital eccentricities ranging from perfectly circular to orbits that are moderately eccentric, or elliptical, where Jupiter’s closest and furthest distances range 20 percent further than usual.

In distance terms, this means Jupiter would rove as much as two astronomical units or Earth-sun distances in its orbit, ranging from 4.2 AU from the Sun to 6.2 AU from the sun.

Meteor Crater, an impact crater created about 50,000 years ago when a 30-meter iron meteor struck the Earth’s surface in Arizona.

The giant Jupiter can redirect asteroid paths towards or away from Earth. Credit: USGS

In addition, the authors moved the entire orbit of Jupiter inwards and outwards (testing what would happen if it had formed closer to the Sun, or further away), and at each new location, again tested a range of orbital eccentricities between circular and moderately eccentric.

This meant that, in their most extreme close-in scenario, Jupiter came all the way in to 3.4 AU at perihelion, while in the most extreme distant scenario, it ranged out to over 7.4 AU from the Sun.

Using tens of thousands of permutations, Waltham and Horner stepped forward each simulation through a million years of time, recording Earth’s orbital parameters every 100 years and then charting the results.

“The default assumption is this is something that is important,” Horner said. “There’s a lot of flexibility where Jupiter will be, and you would assume that you’d have a very smooth, very gentle variation in how the Earth’s orbit behaves over time.”

The model showed that most of Jupiter’s locations resulted in little change in Earth’s orbit and tilt, although the effect on Earth’s climate is unclear.

Horner said he is working with James Gilmore, a climatologist at University of London, to better understand how changes in the Earth’s tilt or orbit would affect its habitability.

Changing the tilt would affect the seasons, while changing the orbit would alter the amount of sun on the surface.

Waltham, meanwhile, says there is a discrepancy between the results in this study and a previous one he had done with analytical equations showing that Jupiter’s position has a striking influence on Earth’s climate.

While he believes this study is more accurate, he wants to go back to his earlier work to resolve the difference.

Searching for life beyond Earth

Although this simulation dealt specifically with the Earth-Jupiter relationship, there are implications for worlds that are beyond our Solar System’s reaches, the researchers said.

Take solar systems that are comprised of planets orbiting in spaces as small as Mercury’s orbit of the Sun.

“It’s about spacing,” Waltham said. “I think there is a strong implication that compact solar systems are less likely to have planets with stable axes, which makes them less likely to be habitable.”

Artist’s conception of Kepler-47, a system with planets orbiting two suns. Studying how Jupiter affects Earth’s habitability could have implication for exoplanets. Credit: NASA/JPL-Caltech/T. Pyle

That said, he warns there are no “absolute rules” about habitability. There could be scenarios where the axis moves too quickly for complex life to keep up, but simple life forms such as bacteria are be able to evolve fast enough to adapt to temperature changes.

Horner, meanwhile, is examining scenarios under which giant planets send giant impactors, such as asteroids, towards inner planets. For Earth, a Jupiter-sized planet is both a good and a bad thing.

The gas giant absorbs some impacts from meteorites, but also alters the orbits of small bodies and could send them towards Earth.

He added that the new research underscores how a small change in parameters could change habitability wildly, pointing to the need to look at more solar systems in formation to see under what conditions planets form.

Examining new solar systems will be a strength of NASA’s forthcoming James Webb Space Telescope, which is launching into space in 2018.

Horner emphasized that the numerous simulations his team ran on Jupiter’s influence in the solar system shows that where planets end up is often a result of chance as much as physics.

“Every object you add to [a planetary] system adds complexity, and the end result is a result of random chances,” said Horner. “So if you change something very small when the solar system is forming, it’s kind of chaotic.”


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