Stellar motion
Gazing out at the night sky, you may not be able to tell that stars are constantly in motion, orbiting the center of the galaxy. The speed at which stars are moving from our perspective on Earth is referred to as radial velocity, or the rate of change in distance between a target and its observer.
This map of the sky reveals the motion of approximately 26 million stars, with different colors indicating the velocities at which the stars are moving. Blue shows the parts of the sky where the average motion of stars is toward us, and red shows the regions where the average motion is away from us. The visualization reveals the circular motion of the stars around the center of the Milky Way, appearing as a perfectly combed sandbox of stellar inhabitants.
