What is a Galaxy?
Galaxies are enormous conglomerations of stars and interstellar material. The qualifying morphological properties of these objects, however, remain flexible due […]
Basics of Calculus
This is a one-page note on the basics of calculus. Introduction to the study of change, Differential Calculus, Integral Calculus, Fundamental Theorem of […]
Isochron Dating Method for Dummies (Like Me)
Discussion of radiometric dating method after article by Young (2007). Click on the title image to open this note in […]
On the White Dwarf Mass Limit and S. Chandrasekhar
Subrahmanyan Chandrasekhar (1910–1995) was born into a Brahmin family in Lahore, then India. At the age as early as 21, […]
Stellar-Mass Black Holes
Stellar-mass black holes are the result of a gravitational collapse of a massive star at the end of its life. […]
150 Years Ago Today… Note on the Variable Nebula in Taurus
Tracing the origins of the discovery and the development of observations of NGC 1555, also referred to as the Hind’s […]
NGC 4755: Color-Magnitude Diagrams (CMDs) and Zero-Age Main Sequence Luminosities
The CMD submitted in the previous fortnight shows members of NGC 4755 – an open cluster in Crux. The stars […]
The Importance of Astrology for the Development and Survival of Astronomy During Medieval Times
As an amateur astronomer, I was to an unnecessary degree opposed to the concept of astrology, especially if questioned about […]