When the cosmos was between 2 and 4 billion years old galaxies were just cranking along, converting huge reservoirs of cold gas into stars at a fierce rate, some easily 100 times what we tend to see today in our 13.8-billion-year-old Universe. Because light takes time to get from them to us, we see these galaxies as being 9–12 billion or so light years from us, and almost all the big ones we see at that distance are the proud parents of huge litters of stars. This was a time of peak star formation in the Universe, and in fact astronomers call it “cosmic noon”.
But — and this is a big but — at that distance the bigger galaxies tend to be luminous, the ones making the most stars. Ones with lower star birth rates are much harder to see, so we may be suffering what’s called an observational bias, or a selection effect. Those faint galaxies might be there, but we can’t see them.
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.
Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.