0

The Discovery of Pluto

via the American Astronomical Society

Speculation about the existence of a planet beyond Neptune began in the late 19th century. A study of perturbations in Uranus’ orbit had led to the prediction of Neptune’s position and subsequent discovery. Further observations suggested that Uranus’ orbit was being influenced by yet another planet. Percival Lowell began the hunt for “Planet X” in 1906 at the observatory he founded in Flagstaff, Arizona. He and William Pickering unsuccessfully conducted the search until Lowell’s death in 1916. The undertaking came to a halt until Lowell Observatory director Vesto Slipher hired Clyde Tombaugh, an amateur astronomer, for the project in 1929. He used a telescope to record sky images on photographic plates for the same sidereal time on different nights, and a blink comparator to flip the resulting plates back and forth. Positions of stars and galaxies would remain constant while those of closer objects such as planets would change from night to night. After a year of searching, on 18 February 1930, Tombaugh finally found the small moving spot he had been looking for; it blinked on the plates for January 23rd and 29th.

Read More!


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.

Join 14,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

CircuitPython 2019!

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7:30pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/


Maker Business — Re-evaluating Amazon after its acquisition of Whole Foods

Wearables — It’s not a deal breaker

Electronics — Motor interference

Biohacking — Vitamin-C + Gelatin for Accelerated Recovery

Python for Microcontrollers — Supercharged Supercon with CircuitPython, Quoth the Raven MOAR PYTHON! #Python #Adafruit #CircuitPython #PythonHardware @circuitpython @micropython @ThePSF @Adafruit

Adafruit IoT Monthly — The S in IoT is for Security, Amazon announces Sidewalk and more!

Microsoft MakeCode — Xenomorph candy bucket and spooky workshops with MakeCode!

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



No Comments

No comments yet.

Sorry, the comment form is closed at this time.