NEBULOSITY IN STAR CLUSTERS.—In a letter to the Observatory for June Dr. Harlow Shapley states that the appearance of nebulosity which has sometimes been noted in visual observations of star clusters ...

After 30 years of observing, I’ve compiled a list of some of my favorite deep-sky objects. These look best with a large telescope, so are great for more experienced observers. One of the strangest ...

Abstract: Intelligent reflecting surface (IRS) is an enabling technology to engineer the radio signal propagation in wireless networks. By smartly tuning the signal reflection via a large number of ...

This is a concise Python 3 programming tutorial for people who think that reading is boring. I try to show everything with simple code examples; there are no long and complicated explanations with ...

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