The Graphical Kernel System (GKS) was the first ISO standard for low level computer graphics, introduced in 1977. GKS provides a set of low-level drawing features for two-dimensional line and vector graphics. The calls are designed to be portable across different programming languages, graphics devices and uses, so that applications written to use GKS will be readily portable to many platforms and devices.
The unusual nova shell GK Per is the result of Nova Persei 1901, a nova which exploded in 1901 about 1500 light years away in the direction of the constellation Perseus.
The first bright nova of the 20th century and the first to be subjected to detailed spectroscopy and photometry, Nova Persei 1901 reached a maximum brightness of 0.2m and declined very rapidly thereafter to its current minimum of 13.1.
GK Per is unique among classical novae, having the longest known period (almost two days) and showing dwarf nova-like outbursts of about 3 mag.
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