- In astronomy, stellar classification is the classification of stars based on their spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting the rainbow of colors interspersed with spectral lines. Each line indicates a particular chemical element or molecule, with the line strength indicating the abundance of that element. The strengths of the different spectral lines vary mainly due to the temperature of the photosphere, although in some cases there are true abundance differences. The spectral class of a star is a short code primarily summarizing the ionization state, giving an objective measure of the photosphere’s temperature.
- Adventure – March 1980 (atariarchive.org)
Of all the original games Atari put out for the VCS, Adventure may be the one that most people are familiar with today. Warren Robinett’s third and final VCS game – though seemingly the second to actually be released – serves as a counterweight to the arcade action of its March 1980 brethren Space Invaders by providing a nearly unique experience on a home console in its day.