# Assessment Instructions: Problem Set 01 — Solar Nebula, Condensation, and Planet Formation

## Inputs to Inspect
Student submission, this problem set, the solution key, the corresponding lecture slides/notes, and the shared
constants in `materials/ASTR320/src/generate_astr320_content.py` where a problem reuses course 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 derivation steps should not. Because this is a 300-level quantitative course, full marks require
a genuine derivation (not just formula substitution) wherever the problem set asks for one.

## Problem-Level Criteria
- Problem 1: density calculation and icy-body comparison both required for full credit.
- Problem 2: linear-mixing estimate must show the algebra, not just state a rock fraction.
- Problem 3: both frost-line values and the sqrt(L) scaling statement are required.
- Problem 4: answer must invoke gravitational focusing and self-stirring specifically, not generic size arguments.
- Problem 5: answer must connect accretion timing to the specific observed compositional percentages.

## 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 convert radius from km to m before computing density (an extremely common unit-conversion slip).
- Treating density differences as automatically proof of composition without considering measurement uncertainty (Problem 1).
- Applying the frost-line formula without correctly propagating the square-root scaling with luminosity (Problem 3).