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Exam 2 ReviewAstronomy 101 Jeopardy
The Interstellar Medium
Measurement Techniques
The Lives of Stars
The Deaths of Stars
The H-R Diagram
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An astronomer studying newborn stars should search for these star-
forming regions of the ISM.
10 points
• Giant molecular clouds
This type of light is the most easily scattered.
20 points
• Blue Light
Thermal energy causes clumps in giantmolecular clouds to increase their temperature;
this form of energy causes the clumps tocontract in size.
30 points
• Gravitational potential energy
OB Associations produce UV radiation whichcan excite or ionize hydrogen atoms, producing
a reddish glow from these types of nebulae.
40 points
• Emission nebulae
Young stars eject mass into space, creating a solar wind that blows away any
remaining parts of the nebula, during this stage of star formation.
50 points
• T Tauri stage
The color index B-V measures a star's apparent magnitude in these two filters.
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• B = Blue
• V = Visible or Yellow
The distance between Earth and a nearby star can be calculated by
measuring this.
20 points
• Parallax angle
We can use apparent magnitudes whendetermining the age of a star cluster becausewe assume all the stars have this in common.
30 points
• Distance from Earth
A parsec is a unit of distance, and is equivalent to this many light
years.
40 points
• 3.26 light years
If we measure a parallax angle of 1 arcsec for a star that we know is 1 pc away, then we know the baseline for
our measurement must be this.
50 points
1 AU (astronomical unit)
Stars spend about 90% of their lifetimes in this region of the H-R diagram.
10 points
• Main Sequence
While on the main sequence, the coreof a star is undergoing nuclear fusion
which turns hydrogen into this element.
Helium
20 points
This spectral type of star (OBAFGKM)spends the longest amount of time on
the main sequence.
30 points
• M Stars
This balance is reached when the inwardpull of gravity is exactly balanced by
a source of outward pressure.
40 points
Hydrostatic Equilibrium
The stellar classifications scheme(OBAFGKM) was originally based on
the strength of absorption lines producedby this element.
50 points
• Hydrogen
Stars leave the main sequence whenthis process stops in their cores.
10 points
• Hydrogen fusion
Very heavy elements, such as gold, are made when very massive stars
become one of these.
20 points
• Supernova explosion
When a star like the Sun dies and becomes a white dwarf, it will be composed mostly of this element.
30 points
• Carbon
This strange form of pressure prevents awhite dwarf from collapsing into a
neutron star or black hole.
40 points
• Electron degeneracy pressure
The cores of very massive stars never reach a degenerate stage between fusion
cycles; thus, massive stars never experience this (which is common in low
mass stars).
50 points
• Helium Flash
The H-R diagram is used to show the relationship between the temperature
of a star and this.
10 points
• Luminosity
Astronomers use these to trace out a star's evolution on the HR
diagram.
20 points
• Evolutionary tracks
These types of diagrams, which plot apparent magnitudes as a function of
color indices, are really H-R diagrams in disguise.
30 points
Color Magnitude Diagrams
Main sequence stars form (approximately) a diagonal line across an H-R diagram. These
types of objects occupy the lower left region of an H-R diagram (high
temperature, low luminosity).
40 points
White dwarfs
The H-R diagram is named after these two astronomers who
developed it.
50 points
Hertzsprung and Russell
Astronomy Jeopardy Rules
• Get into groups of 4-5 people and select one person to be the team “buzzer.”
• After a question is asked, everyone on a team must agree on the answer.
• When you have the answer, the team “buzzer” who puts his/her hand up fastest will be called on first.
• You must answer in the form of a question! No shouting out answers!
Play Jeopardy!
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