We are independent & ad-supported. We may earn a commission for purchases made through our links.

Advertiser Disclosure

Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.

How We Make Money

We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently from our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

What is Gravitomagnetism?

Michael Anissimov
By
Updated Feb 19, 2024
Our promise to you
AllTheScience is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At AllTheScience, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

Gravitomagnetism, a theoretical idea around since 1918, is a predicted consequence of general relativity, from which it was derived. Its existence has been experimentally proven, but allegedly only once, and there are certain variants of the effect that are supported by the evidence to greater or lesser degrees. An international team claimed to discover the effect in the mid-90s, based on data from the LAGEOS I and LAGEOS II spacecraft. The measured effect was within 10% of that predicted by general relativity, although some scientists still doubt the validity of these results. In 2004, Stanford physicists launched Gravity Probe B, an extremely delicate gyroscope package, to measure gravitomagnetism in outer space with much greater precision. Its data is currently being analyzed.

After Einstein presented his theory of general relativity, it took decades to work out all of its predicted consequences. The most famous is the fundamental equivalence between matter and energy, demonstrated vividly by the atomic bomb. Lorentz contraction, the increase in mass and decrease in length seen by an outside observer looking at an object moving at relativistic (near-light) speeds, is another, and has been experimentally verified. Time is known to pass more slowly for objects moving at speeds close to that of light, or even significantly less - the effect has been observed in atomic clocks orbiting the earth.

This poorly exposed and tested consequence, gravitomagnetism, refers to the field that is supposedly created when a massive body rotates rapidly. Gravitomagnetism is misleadingly named - it is not magnetic - the force created emerges from gravity, not electromagnetism. But it is called gravitomagnetism because of the mathematical similarity between the equations that describe this effect and the creation of a magnetic field. In the same way that a magnetic field is created when a charged object rotates, a gravitomagnetic field is created when a massive body rotates. The math used to describe the two is functionally similar The effect could just as easily be called a gravitorotational field, a term which might be less misleading.

A very powerful gravitomagnetic field is expected to be observed around supermassive black holes rotating very rapidly. These black holes may have a mass millions of times greater than the sun and be rotating at a furious rate. Here in the solar system, though, the effect is predicted to be very small - on the order of a few parts per trillion in the overall scheme of gravitational interactions - making it difficult to observe without delicate sensors or proximity to massive planets or the sun.

Stanford's Gravity Probe B was extremely delicate. It contained a gyroscope with an object that was spherical to 40 atomic diameters, possessing a near-homogeneous density distribution. Designed to detect gravitomagnetism, the gyroscope was meant to measure "frame-dragging" - the source of the predicted effect is a small twist in spacetime created by the rotating mass. A spinning gyroscope in a vacuum should rotate with almost perfect uniformity, but it is predicted that gravitomagnetism disturbs this slightly. The simple way to visualize frame-dragging is to imagine a ball rotating on a stretched sheet, that creates a slight twist in the sheet at the same time as creating a major depression.

Another predicted effect is that when a satellite orbits the earth in what should be a perfect circle, it actually ends up in a slightly different place, due to the slight vortex created by the spinning earth. A difficulty in measuring gravitomagnetism is that the earth's equatorial bulge creates discrepancies in satellite/gyroscope behavior that must be correctly subtracted from other data in order to measure the magnitude of genuine frame-dragging.

Although a large amount of data has been returned from the Gravity Probe B, the analysis is ongoing. Gravitomagnetism is quite mysterious, and currently poorly understood. Whether the effect will have practical applications or not is something we will probably not know for at least a few decades.

AllTheScience is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Michael Anissimov
By Michael Anissimov

Michael is a longtime AllTheScience contributor who specializes in topics relating to paleontology, physics, biology, astronomy, chemistry, and futurism. In addition to being an avid blogger, Michael is particularly passionate about stem cell research, regenerative medicine, and life extension therapies. He has also worked for the Methuselah Foundation, the Singularity Institute for Artificial Intelligence, and the Lifeboat Foundation.

Discussion Comments

By anon323132 — On Mar 03, 2013

I don't follow how there can be any uncertainty about the existence of gravitomagnetism. It is a direct result of special relativity, and is obviously required for special relativity to be correct.

Consider a planet like Saturn, with a ring system, passing an observer at near-light speeds. SR says that in the observer's frame, the rings, which are circular in the planet's rest frame, will be flattened into ellipses. Yet the only forces acting on the rings are gravitational. Simple Newtonian gravitation cannot explain such orbits. The observer can only explain what he sees as being the result of gravitomagnetic fields produced by the mass current.

By anon180097 — On May 25, 2011

Saninassif is right. Explanation: disk galaxies once were elliptic or spheric galaxies, and the stars' orbits all swiveled into flat, prograde orbits with the same velocity, due to the central black hole's vortex. No dark matter! Look up Thierry De Mees Grav1

By saninassif — On Jan 27, 2011

I don't understand. Correct me if I'm wrong, but doesn't just about everything in our milky way and in many other galaxies, for that matter, rotate around the supermassive black hole in the center of the galaxies in the same direction?

This proves to me that the spin of the supermassive black hole is dragging space-time (gravitomagnetism) and making everything rotate around the supermassive black hole in the same direction. Am I wrong here? I mean, when you look at disk galaxies they all look like a vortex. Please give me your feedback.

By anon132991 — On Dec 09, 2010

Gravitomagnetism solved a large amount of issues that remained mysteries for the General Relativity Theory.

By anon126812 — On Nov 14, 2010

Gravitomagnetism looks much more natural than leading to many controversies GRT and it naturally unify with electromagnetism: e.g. these two interactions describes dynamics of rotations in 4D - spatial rotations leads to EM and small rotations of local time axis are governed by GM (5th section of arxiv:0910.2724 ).

So maybe spacetime is flat and what is curved is space alone - submanifolds of constant time (orthogonal to central axes of light cone).

By anon102620 — On Aug 09, 2010

Gravitomagnetism is not the pure general relativity. Its derivation requires the formal adoption of the equation borrowed from maxwell's equation. People say it is an approximation but that is not even close. This is the biggest blunder of the gravitational physics. The gravitational dipole moment from the linearized theory of general relativity is the true magnetic gravity. Look at the papers of Dr. Eue Jin Jeong on dipole gravity.

By anon22010 — On Nov 26, 2008

E=mc^2 demonstrated by the atomic bomb? Come on. Not any more than in a chemical bomb. Sure the rest mass decreases when energy is liberated, but so does it in any other process. The difference is simply one of scale.

Can we get rid of the misunderstanding that the strong force is the only force able to change the rest mass of particles? It is simply stronger.

By anon1589 — On Jun 07, 2007

21 December 2012 will be a time of high probability for CMEs while Earth's magnetism is weak (already reversed in South Atlantic)and we are crossing the galactic equator. Therefore, it would be intelligent to see in the geological record what happened 25,800 years ago (when we crossed) and what happened 780,000 years ago (when we were weak magnetically). Was there a polar shift 25,800 years ago? And will a CME knock out our electronics?

By anon676 — On May 01, 2007

There is a theory of dipole gravity (gravito magnetism) proposed by Dr. Eue Jin Jeong which predicts jets phenomena, explains dark matter problems and also the dark matter halo. It's a serious theory and you don't want to miss it.

Michael Anissimov

Michael Anissimov

Michael is a longtime AllTheScience contributor who specializes in topics relating to paleontology, physics, biology...

Read more
AllTheScience, in your inbox

Our latest articles, guides, and more, delivered daily.

AllTheScience, in your inbox

Our latest articles, guides, and more, delivered daily.