Milky Way’s Spiral Motion Revealed | Gaia Mission Discovers Galactic Ripple High-precision data from the ESA Gaia mission reveals that stars near the Sun are not moving smoothly. Instead, they form a spiral pattern in space and velocity, known as a phase-space spiral. This structure shows that the Milky Way’s disk is still dynamically oscillating, likely caused by a past encounter with the Sagittarius dwarf galaxy. The discovery reveals that the Milky Way is a responsive, evolving system, with s

We’ve never actually seen the Milky Way’s spiral shape from the outside.Why? Because we’re inside it! Our solar system is located within one of the galaxy’s spiral arms, so we can only observe parts of the Milky Way from our perspective on Earth. The iconic spiral images you see are artist’s impressions or computer models based on indirect observations like star distribution, radio waves, and cosmic mapping techniques. So, while we understand its general shape, no spacecraft has ever traveled fa