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Open cluster: Quiz


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Question 1: While hydrogen nuclei cannot fuse to form ________ until the temperature reaches about 10 million K, lithium and beryllium are destroyed at temperatures of 2.5 million K and 3.5 million K respectively.

Question 2: Many open clusters are inherently unstable, with a small enough mass that the ________ of the system is lower than the average velocity of the constituent stars.
Escape velocityMoonSolar SystemGravity assist

Question 3: [1] In contrast, ________ are very tightly bound by gravity.
Triangulum GalaxyGlobular clusterAndromeda GalaxyOrion Nebula

Question 4: Others were known as fuzzy patches of light, but had to wait until the invention of the ________ to be resolved into their constituent stars.
AstronomyTelescopeOptical telescopeReflecting telescope

Question 5: When a ________ is plotted for an open cluster, most stars lie on the main sequence.
Binary starStellar classificationStellar evolutionHertzsprung–Russell diagram

Question 6: While the reason for this underabundance is not yet fully understood, one possibility is that ________ in stellar interiors can 'overshoot' into regions where radiation is normally the dominant mode of energy transport.

Question 7: An open cluster is a group of up to a few thousand stars that were formed from the same ________, and are still loosely gravitationally bound to each other.
Star formationStellar kinematicsMolecular cloudStellar classification

Question 8: Open clusters are very important objects in the study of ________.
StarWhite dwarfStellar evolutionSupernova

Question 9: Open clusters have been found only in spiral and irregular galaxies, in which active ________ is occurring.
SupernovaHerbig–Haro objectStar formationWhite dwarf

Question 10: After a cluster has become gravitationally unbound, many of its constituent stars will still be moving through space on similar trajectories, in what is known as a ________, moving cluster, or moving group.
Stellar kinematicsStar systemMultiple starBinary star


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