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#1
By Ahmed Akber
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Easy
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Fact Checked
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03 Jun 2026
What does an observer on Earth see when looking at a star located 100 light-years away?
💡 Explanation:A light-year is the distance light travels in one year. Because light takes time to travel across space, observing an object 100 light-years away means seeing the light that left it a century ago.
#2
By Ahmed Akber
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Easy
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Fact Checked
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04 Apr 2026
Which celestial alignment is necessary for a total lunar eclipse to occur?
💡 Explanation:A lunar eclipse occurs when the Earth moves between the Sun and the Moon, causing the Earth's shadow to fall on the lunar surface during a full moon.
#3
By Rabia Anum
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Medium
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Fact Checked
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22 Feb 2026
Which physical property primarily determines a star’s lifecycle, luminosity, and eventual fate?
💡 Explanation:A star's initial mass is the most critical factor in its evolution; it determines the core pressure, the rate of nuclear fusion, and whether the star will end as a white dwarf, neutron star, or black hole.
#4
By Kalsoom Tahir
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Medium
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Fact Checked
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04 Feb 2026
Which two factors primarily determine a planet’s gravitational escape velocity?
💡 Explanation:The escape velocity from a celestial body is directly proportional to the square root of its mass and inversely proportional to the square root of its radius (Ve = sqrt(2GM/R)). Therefore, mass and radius are the fundamental factors determining a planet's escape velocity.
#5
By Kalsoom Tahir
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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.
#6
By Rabia Anum
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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.
#7
By Kalsoom Tahir
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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.
#8
By Ahmed Akber
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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.
#9
By Rabia Anum
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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.
#10
By Rabia Anum
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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.
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