Abstract: The Breakthrough Starshot project proposes using radiation-pressure propulsion to send multiple spacecraft in the gram-range mass to interstellar targets. There are numerous engineering challenges to accomplishing this mission, but their project discusses speeds and accelerations previously only discussed for cannon projectiles and particle physics experiments. This article examines the problem from first principles to see if the project is even orders-of-magnitude possible. A preliminary check on their numbers seems to confirm that the project is possible in principle.
https://stkwans.blogspot.com/2012/04/program-66.html is about the Apollo guidance computer.
https://stkwans.blogspot.com/2012/09/a-review-of-adxl345-and-bma180.html

CPU History Museum for Intel CPUs, AMD Processor, Cyrix Microprocessors, Microcontrollers and more.
Also has information about processors used in space missions:
http://www.cpushack.com/space-craft-cpu.html

The purpose of this project is to provide a computer simulation of the onboard guidance computers used in the Apollo Program's lunar missions, and to generally allow you to learn about these guidance computers.
See also the source code at https://github.com/chrislgarry/Apollo-11/

Graphical demonstration of space debris.

Photo collage of all largish bodies in the Solar system.

New orbit trajectory calculations by Russian scientists contradict NASA's original projections that the golf ball will orbit the earth for approximately 3 days, and suggest a 3 1/2 year orbit is more likely, as the ball will descend by a few yards a day.

I want to see what I get for the orbital lifetime of the golf ball.

Satellite orbit data (TLE), software and links.