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#1
By TheQuizWire
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Hard
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Fact Checked
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23 Jan 2026
What is the key factor determining a collapsing massive star’s fate: neutron star or black hole?
💡 Explanation:The final fate of a massive star (forming a neutron star or a black hole) is primarily determined by the mass of the compact remnant core <strong>after</strong> the supernova explosion and significant mass loss. If the remnant core's mass exceeds the Tolman-Oppenheimer-Volkoff (TOV) limit (approx. 2.1 to 3.0 solar masses), the internal pressure (neutron degeneracy pressure) is insufficient to resist gravity, leading to the formation of a black hole. If the core mass is below this limit, it stabilizes as a neutron star.
#2
By TheQuizWire
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Medium
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Fact Checked
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19 Jan 2026
What two stellar properties are primarily related and plotted on the Hertzsprung-Russell (H-R) diagram?
💡 Explanation:The Hertzsprung-Russell (H-R) diagram is a pivotal tool in astronomy that visually represents the relationship between a star's intrinsic brightness, or luminosity (vertical axis), and its surface temperature, or spectral type/color index (horizontal axis). It is fundamental for understanding stellar evolution.
#3
By TheQuizWire
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Easy
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Fact Checked
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25 Dec 2025
How does a planet’s orbital speed change as its distance from the Sun decreases?
💡 Explanation:According to Kepler's Second Law (the Law of Equal Areas), a line joining a planet and the Sun sweeps out equal areas during equal intervals of time. For the area swept to be equal, the planet must move faster when it is closer to the Sun (a shorter radius) and slower when it is farther away (a longer radius). This relationship is a consequence of the conservation of angular momentum and requires analysis of the physical implications of Kepler's Law.
#4
By TheQuizWire
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Hard
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Fact Checked
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13 Dec 2025
Galaxy A has a greater cosmological redshift than Galaxy B. What does this imply about Galaxy A?
💡 Explanation:According to Hubble's Law, a galaxy's recessional velocity ($v$) is directly proportional to its distance ($d$) from the observer ($v = H_0d$). Cosmological redshift is the measure of this recessional velocity, caused by the expansion of space itself. Therefore, a greater cosmological redshift implies a greater recessional speed and thus a greater distance from the observer.
#5
By TheQuizWire
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Hard
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Fact Checked
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07 Dec 2025
The Chandrasekhar limit marks the failure of which pressure against gravitational collapse in a white dwarf star?
💡 Explanation:The Chandrasekhar Limit (approximately 1.44 solar masses) is the maximum mass for a stable white dwarf. White dwarfs are primarily supported against gravitational collapse by a quantum mechanical effect called electron degeneracy pressure. When a white dwarf exceeds this critical mass, the electron degeneracy pressure is insufficient to counteract the crushing force of gravity, leading to a catastrophic core collapse, typically resulting in a Type Ia supernova and formation of a neutron star or black hole. Thermal pressure (B) supports main-sequence stars, and neutron degeneracy pressure (D) supports neutron stars.
#6
By TheQuizWire
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Medium
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18 Nov 2025
The Earth experiences changing seasons throughout the year. What astronomical factor is the primary cause of these seasons?
💡 Explanation:Seasons are caused by the 23.5-degree tilt of the Earth's axis as it orbits the Sun, which changes the directness and duration of sunlight hitting different hemispheres.
#7
By TheQuizWire
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Easy
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03 Nov 2025
The main asteroid belt is located between which two planets?
💡 Explanation:The main asteroid belt orbits the Sun between Mars and Jupiter.
#8
By TheQuizWire
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Medium
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03 Nov 2025
What phase will the Sun enter after exhausting its hydrogen fuel?
💡 Explanation:The Sun will expand into a Red Giant after it burns through its core hydrogen.
#9
By TheQuizWire
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Medium
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02 Nov 2025
What event marks the explosive death of a massive star?
💡 Explanation:A supernova is the catastrophic explosion of a massive star at the end of its life cycle.
#10
By TheQuizWire
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Medium
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30 Oct 2025
What does a sun-like star become after shedding its outer layers?
💡 Explanation:After the Red Giant phase, a star like the Sun sheds its layers, leaving behind a dense White Dwarf core.
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