# Assessment Instructions: Problem Set 05 — Black Holes and the Milky Way Rotation Curve/Dark Matter

## Inputs to Inspect
Student submission, this problem set, the solution key, the corresponding lecture slides/notes, and the referenced dataset(s) under `materials/ASTR230/data/`.

## Grading Standard
Award credit for correct method and units first, then for the specific numeric result. A student who shows correct reasoning with a small arithmetic slip should receive most of the available credit; a student with a correct-looking number but no visible reduction steps should not.

## Problem-Level Criteria
- Problem 1: 15 points — Correct Schwarzschild radius with visible unit conversions.
- Problem 2: 15 points — Correct Earth Schwarzschild radius and correct compression-factor comparison.
- Problem 3: 15 points — Correct enclosed-mass calculation with unit conversions shown.
- Problem 4: 15 points — Correct dark-to-visible mass ratio and sound interpretation.

## Resubmission Policy
Students may resubmit within one week of receiving feedback. A resubmission must show a corrected derivation, not only a corrected final number, and should reference the specific feedback comment it addresses. Regrade to a maximum of 90% of the original point value unless the error was a grading mistake.

## Common Errors to Flag
- Forgetting to square the speed of light in the Schwarzschild radius denominator.
- Mixing up kpc-to-meter and km/s-to-m/s conversions (off by factors of 1000).
- Reporting a dark-matter fraction rather than the ratio actually requested.