- Does a fire lose mass?
- A Small Black Hole
- A Black Hole at the Center of Messier 87
- Stars Falling into the Black Hole in Messier 87
- A Black Hole at the Center of Our Galaxy?
- Calibrating the Period / Luminosity Relation For Cepheid Variable Stars
- How Hubble Found His Law
- Hubble’s law is universal
- A Different Law Than Hubble’s Would Not Have Been Universal
- Geometry and the thermal expansion of solids
- Using the Olbers’ Paradox Calculation: Nighttime In the Center of a Globular Cluster