Bonus

Stars in these systems have approximately the same age because they formed from the same molecular cloud. For 10 points each:
[10e] Name these systems that differ from stellar associations by being gravitationally bound. The Pleiades (“PLEE-uh-deez”) and Hyades (“HY-uh-deez”) are examples of the “open” type of these systems, which are much younger than “globular” ones.
ANSWER: star clusters [accept globular clusters or open clusters]
[10h] The age of a cluster can be determined by plotting its members on the H–R diagram and fitting one of these curves. One can estimate that fit by comparing these curves’ main-sequence turnoff points to the data.
ANSWER: stellar isochrones (“ICE-uh-krones”)
[10m] Knowing a cluster’s value for this quantity is necessary to determine its age, as increasing either variable shifts isochrones to the right. High values of this quantity differentiate Population I stars from Populations II and III.
ANSWER: metallicity [accept metal content or metal richness; prompt on Z]
<Other Science>
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Conversion

TeamOpponentPart 1Part 2Part 3TotalParts
Arizona StateGeorgia State1001020EM
British ColumbiaYale1001020EM
Chicago AUC Berkeley A1001020EM
Columbia BMichigan1001020EM
FloridaOttawa1001020EM
Georgia TechVirginia Tech100010E
HarvardToronto C1001020EM
Illinois ANorth Carolina A1001020EM
Illinois BMaryland100010E
Iowa StateToronto B1001020EM
Johns HopkinsChicago B1001020EM
MITCornell A1001020EM
MinnesotaTexas1001020EM
NYULSE100010E
North Carolina BUCF0000
NorthwesternToronto A1001020EM
RITVanderbilt100010E
RutgersStanford1001020EM
UC Berkeley BPenn State100010E
VirginiaOhio State100010E
WUSTL AColumbia A1001020EM
WUSTL BWaterloo B1001020EM
Waterloo AIndiana1001020EM
Winona StateCornell B0000

Summary

TournamentExact Match?HeardPPBEasy %Medium %Hard %
2025 ACF NationalsYes2415.8392%67%0%