What could we choose as the seven most remarkable celestial objects visible either with our eyes or with a small telescope?

Since the discovery of planetary nebulae in the late 1700s, astronomers have learned that these expanding shells of glowing ...

How was the slice made? If the cube’s side is half an inch, what is the side of the hexagon? After dropping the cube into his coffee, the engineer turned his attention to a doughnut lying flat on a ...