A paper recently published by a team of astronomers used Gaia to investigate these galaxies. They looked at stars in 74 dwarf galaxies in the Local Group (which includes a few whose status in the Group is unclear). Incredibly, they found what they consider to be reliable motions for 66 of them. Most are within 1.5 million light years of the Milky Way, but some are as far as 4.5 million light years from us.
Doing this is painstaking work. First, we are inside the Milky Way, so when you look toward any particular galaxy outside ours, there are local stars in the way. Sometimes it’s easy to know which galaxy they belong to, but for most it’s not. They used various schemes to figure that out (for example, looking at the colors and ages of stars to see if they make sense for the host galaxy), and were able to get enough stars in these galaxies to see the motions over the 34 months covered by the Gaia observations.
8-6-2021 (August 6, 2021) is the Snakiest day of the year and it’s also this year’s CircuitPython Day! The day highlights all things CircuitPython and Python on Hardware. See you there!
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.