The Milky Way doesn’t orbit a single object the way Earth orbits the Sun. Instead, our galaxy is caught in a web of gravitational relationships, pulled and pushed by structures at every scale, from a nearby giant galaxy to vast concentrations of matter hundreds of millions of light-years away. The short answer is that the Milky Way falls toward the gravitational center of ever-larger structures while those structures themselves are in motion, creating a layered journey through space with no single, fixed center.
The Milky Way and Andromeda: A Shared Gravity Well
The most immediate gravitational relationship the Milky Way has is with the Andromeda galaxy, about 2.5 million light-years away. These two massive spiral galaxies dominate a neighborhood called the Local Group, a collection of over 30 galaxies spread across roughly 10 million light-years. The center of mass of the Local Group sits somewhere between the Milky Way and Andromeda, and both galaxies move around that shared balance point.
Andromeda has been heading toward us for over a century of observation. For a long time, astronomers treated a collision as nearly certain, projected to happen in about 5 billion years. A 2025 study published in Nature Astronomy revised that outlook significantly, finding the probability of a direct collision is closer to 50-50 within the next 10 billion years. The two galaxies may make a close pass and swing apart rather than merging into a single elliptical galaxy. Either way, this mutual gravitational dance is the closest thing the Milky Way has to a traditional orbit at the galactic scale.
Falling Toward the Virgo Cluster
Zoom out further and the Local Group is just one small piece of a much larger neighborhood. The Virgo Cluster, a dense collection of over a thousand galaxies about 50 million light-years away, exerts a strong gravitational tug on everything around it. The entire Local Group is drifting toward Virgo at roughly 200 kilometers per second, on top of the expansion of the universe pushing everything apart. This isn’t an orbit in the classical sense. The Local Group isn’t circling Virgo the way a planet circles a star. It’s more like a slow gravitational fall, pulled inward by the cluster’s enormous mass.
The Laniakea Supercluster
In 2014, a team of astronomers mapped the large-scale flow of galaxies in our region of the universe and discovered that the Milky Way belongs to an immense structure they named Laniakea, from the Hawaiian words for “spacious heaven.” Laniakea spans about 520 million light-years across and contains roughly 100,000 galaxies with a combined mass of about 100 million billion suns.
The researchers defined Laniakea by tracing the paths galaxies follow under gravity’s influence. Imagine dropping a marble on a landscape of hills and valleys: the marble rolls downhill toward the lowest point in its basin. Galaxies in Laniakea behave similarly, flowing along gravitational streamlines that converge near a region called the Norma Cluster. The Milky Way sits near the edge of this basin, close to a boundary where the flow could tip toward a neighboring supercluster instead. We’re not orbiting the center of Laniakea. We’re sliding toward it along invisible gravitational contours.
The Great Attractor and Beyond
One of the most famous gravitational mysteries in astronomy is the Great Attractor, a region 150 to 250 million light-years from Earth in the direction of the constellations Triangulum Australe and Norma. The Milky Way and thousands of other galaxies are moving toward it at about 600 kilometers per second. For decades, astronomers struggled to study it because it lies behind the dense plane of our own galaxy, which blocks visible light from that direction.
The Great Attractor turns out not to be a single massive object. It’s essentially the central gravitational point of the Laniakea supercluster, a place where the combined pull of many galaxy clusters converges. Think of it less as a thing and more as a location, the bottom of the gravitational valley our galaxy inhabits.
But the Great Attractor isn’t the only force shaping our trajectory. The Shapley Supercluster, about 650 million light-years away and packing the mass of roughly 8,000 normal galaxies, pulls on us even more strongly. On the opposite side of the sky, a vast region with very little matter, called the Dipole Repeller, effectively pushes us in the same direction. The Shapley Supercluster’s gravitational attraction and the Dipole Repeller’s lack of resistance contribute roughly equally to the Local Group’s motion. Our galaxy sits between these two influences, nudged from behind and pulled from ahead.
The Cosmic Web as Scaffolding
All of this motion happens along an invisible framework called the cosmic web. About 85% of all matter in the universe is dark matter, a substance that doesn’t emit light but exerts gravity. Under its influence, matter has organized itself into a vast network of filaments, like threads in a three-dimensional spider web, with galaxies forming at the intersections. Gas flows along these filaments, feeding star formation where they meet.
The Milky Way’s path through space follows these filaments. Rather than orbiting any single point, our galaxy is channeled along dark matter highways, pulled toward the densest nodes and away from the emptiest voids. The cosmic web acts as the scaffolding for everything visible in the universe, and our galaxy is embedded within it.
How Fast We’re Actually Moving
Scientists measure the Milky Way’s absolute motion against the oldest light in the universe: the cosmic microwave background radiation, a faint glow left over from the Big Bang. Relative to this backdrop, our solar system moves at about 370 kilometers per second. The Local Group as a whole moves at roughly 631 kilometers per second toward a point in the sky that reflects the combined pull of all the structures described above.
These velocities stack on top of each other. The Sun orbits the center of the Milky Way at about 230 kilometers per second. The Milky Way moves within the Local Group. The Local Group falls toward the Virgo Cluster. The whole region flows toward the Great Attractor and the Shapley Supercluster. And all of it sits on an expanding fabric of space that carries every galaxy away from every other galaxy at the largest scales. No single orbit defines our motion. Instead, the Milky Way rides a cascade of gravitational influences, each one nested inside something larger, with no fixed center and no final destination.