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Other galaxies are just ancient snapshots, but we watch the Milky Way live. Comparing data over 30 years, scientists found that the Galaxy’s center is, like, speeding up: the supermassive black hole got heavier, swallowing the mass of a large asteroid each year; the stellar bar (a huge beam of billions of suns, like the crossbar of a merry-go-round) started spinning 5% faster; and the Sun moved closer to the axis: we’re 1,700 light-years nearer to the center than we thought.

These changes are linked. Perhaps more gas is flowing into the Galaxy’s core, or dark matter (the invisible framework that holds stars together) is altering the celestial mechanics. The whole system behaves like a mechanism come to life, with gears suddenly spinning faster. If you watched our star city from the outside, the bar’s acceleration would be noticeable within the span of a single movie: that’s how rapid it is.

Original abstract

as written by the authors arXiv:2603.29503

How do galaxies form and evolve? This is one of the most puzzling questions in astronomy. Galaxy assembly takes place throughout the entire history of the Universe, but our understanding of it is hampered by the unfortunate fact that we can only observe galaxies at a single moment in time. Here, we use archival data of decades-long monitoring of the Milky Way to examine some of its key characteristics, namely the mass of its central black hole, the pattern speed of the bar, and the distance from the Sun to the Galactic centre. We find a surprisingly fast evolution of these three properties on a timescale of only a few decades, and speculate that it might be driven by shared physical processes.