A namesake "ladder" for this quantity suggests that no single technique measures it well at all orders of magnitude.
To measure this quantity, you can first determine a function based on the lambda-5007 line for doubly-ionized oxygen to create a PNLF, which then allows for easy calculation of this quantity. Along with PNLF, "interstellar reddening" is used to calculate this quantity for planetary nebulae. A namesake "ladder" for this quantity suggests that no single technique measures it well at all orders of magnitude. Type Ia supernovae and Cepheid variables are a part of a broader class of techniques to measure this quantity known as the (*) "standard candle" approach, which compares observed luminosity to actual luminosity. This quantity is inversely proportional to parallax, and it can be measured in parsecs. For 10 points, name this quantity measured in light years.
To measure this quantity, you can first determine a function based on the lambda-5007 line for doubly-ionized oxygen to create a PNLF, which then allows for easy calculation of this quantity.
distance