Solar Power & Energy
Generalized Nucleosynthesis
H-R Diagram & Mass
Stellar Equilibrium & Forces
Earth's Habitability
100
What nuclear reaction process in the Sun fuses four Hydrogen protons into one Helium-4 nucleus?
Nuclear Fusion
100
A - D - C -B
100
What physical properties are plotted on the horizontal (X) and vertical (Y) axes of the H-R Diagram?
What are Surface Temperature & Color (X-axis, reversed) and Luminosity / Energy Output & mass (Y-axis)?
100
What force constantly pulls a star's gas inward toward its center of mass?
: What is Gravity?
100
In the core's primary fusion equation, what atomic nuclei combine to release energy?
What are hydrogen nuclei?
200
Spectroscopy reveals that approximately 73% of the Sun's atmosphere consists of which element?
What is Hydrogen?
200
What forces causes a Main Sequence star to turn into Red Giants.
All hydrogen gone.
Gravity
200
What is the total estimated Main Sequence active lifespan of a 1 Solar Mass star like our Sun?
What is 10 Billion Years?
200
What outward force is generated in a star's core to oppose gravity?
What is Nuclear Fusion Pressure?
200
How many millions of years ago did Earth's first liquid oceans form via precipitation?
What is 3,800 mya (3.8 billion years ago)?
300
How much energy (in MeV) is released in a single nuclear fusion reaction converting Hydrogen to Helium?
What is 17.6 MeV?
300
In massive evolved stars >8 M_sun), nucleosynthesis creates an 'onion-skin' shell structure terminating at what element core?
What is Iron (Fe-26)?
300
What are some properties of the star Procyon B ?
What is color-white, Temperature-7500 – 9999 K,
.1 / Luminosity 10-1 or 10-2 solar radius
300
When inward gravity and outward fusion pressure are perfectly balanced, a star achieves what state?
What is Hydrostatic Equilibrium?
300
Approximately how long has the Sun provided the steady amount of energy required for liquid water to remain on Earth's surface?
What is nearly 4 to 5 billion years?
400
If the Sun were powered purely by chemical combustion, what is the maximum lifetime it could sustain?
What is 50,000 years?
400
In 600 years what element will form?
What is Oxygen
400
Why do massive Blue Giants burn through their fuel supply exponentially faster than low-mass stars?
What is: Extreme core gravity forces temperatures to skyrocket, drastically accelerating the fusion rate
400
Clue: What happens to a star's core and outer envelope when core Hydrogen fuel is completely exhausted?
Core contracts under gravity while the outer envelope expands and cools into a Red Giant?
400
Why has the long-term stability of the Sun's energy release been essential for Earth?
What is it allowed enough time for life to exist and complex organisms to evolve?
500
What geological evidence on Earth proves the Sun has provided a steady energy output for over 3.8 billion years?
What are Marine Sedimentary Rocks (proving 3.8+ Billion Years of Liquid Oceans)
500
By what process are elements heavier than Iron (Gold, Lead, Uranium)synthesized
During a Supernova collapse?
500
A 40 Solar Mass Blue Giant star Spica lifetime of approximately how many years?
What is Lifetime 107 yrs
500
What sudden event occurs in a massive star when the iron core can no longer generate fusion pressure?
What is Gravitational Core Collapse resulting in a Supernova?
500
Why is hydrogen fusion into helium in the Sun considered an irreversible reaction?
What is helium will not spontaneously break back down into hydrogen under solar core conditions?