## The Anatomy of Black Holes - Page 14

- How do these things compare to common items, especially to the densest things you can think of?
- What about the density of a neutron star (1.5x10
^{15}g/cm^{3})?

Extension:

For those classes with graphing calculators, this lab is easily extended. Enter the radius values as L1 and the density values as L2. Perform a Power Regression to find a fit to the data. What sort of relationship do you find? Trace the values of X back to the point that it equals the radius you must achieve to have your aluminum foil star become a black hole. What is the Y value at that point? Alternatively, have them enter the required X value into the fit equation and calculate the Y value that corresponds to it - in other words, at the radius required to make our foil star a black hole, what is the density?

Based on an idea from Jeffrey F. Lockwood, Sahuaro High School, Tucson, AZ.