Until recently, it was almost unanimously assumed that huge amounts of invisible dark matter was the key to galaxy formation; the gravitational effects experienced and induced by clumps of dark matter in the universe produced swirling disks of gas clouds, stars and dark matter. Dark matter had to make up the majority of matter in these galaxies, according to standard models of the universe, otherwise they would never have formed.
But since 2016, researchers keep stumbling upon galaxies that don’t seem to be dominated by dark matter. Some calculations imply that these galaxies lack dark matter entirely. Either way, galaxies which have far less dark matter than expected would give physicists a lot of explaining to do: why are they lacking dark matter, and how did they form in the first place?
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.