Abstract
In the early 21st century, modern ground-based very-high-energy gamma-ray observatories have ushered in a new era of astronomy. The number of known gamma-ray sources increased from the handful detected prior to 2002 to more than 150 a decade later. Using three types of telescopes - small, medium, and large-sized - the CTA array will observe many new objects and phenomena. One of these instruments is being designed by Polish scientists and engineers.
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