Fast stars reveal the Sun’s galactic path ⚡ экспресс
An analysis was performed of the kinematic parameters of high-velocity stars located within 100 kpc of the Sun. The sample includes three observational programs comprising 591, 87, and 519 stars at distances from 0.1 to ~109 kpc. For each star, the spatial velocity components (U, V, W) in the galactic coordinate system were computed, along with velocity dispersions (σ₁, σ₂, σ₃). The coordinates of the convergence point (A₀, D₀) and the Sun's velocity relative to the local standard of rest were determined. The obtained results refine the kinematics of the outer regions of the Galaxy and are important for testing models of the Milky Way's gravitational potential.
Our Galaxy is a grand highway where stars race along their paths. Just as a driver gauges their speed by watching neighboring cars, astronomers determined the trajectory of the Sun from the motion of nearly 1,200 ultrafast stars. For each one, they measured the velocity along the line of sight (spectroscopy) and the shift on the sky, assembling a complete 3D picture. An unexpected twist: some of these stars are accelerated so powerfully by the central black hole that they are flung off the galactic “road” forever.
But the key is that these “runaways” reveal the invisible skeleton of the Galaxy. Their trajectories betray the pull of dark matter — the mysterious mass that doesn’t shine but holds the stars together. This method of “weighing” the cosmos was first proposed by Fritz Zwicky and Vera Rubin, who noticed that visible matter alone cannot explain the speeds of stars and galaxies.
🎯 One of these stars is racing at 1,200 km/s — fast enough to travel from Earth to the Moon in five minutes.
🎬 Fast stars leaving the Galaxy evoke generation ships from science fiction, where the stars themselves are the eternal travelers.