Science What is the source of the term “right ascension”? Why is it right ascension and not simply ascension, as with declination?
Science, Solar System Do the giant planets – Jupiter, Saturn, Neptune, and Uranus – have solid cores? If so, what are they made of?
Science How can CCD images just a few minutes long be combined into one photo that shows details not visible in the originals?
Observing Many articles and books on observing refer to small, medium, and large telescopes, but what are the borderlines in objective size that define small, medium, and large?
