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#1
By Ahmed Akber
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Medium
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31 Aug 2026
What is the primary scientific objective of the NASA Nancy Grace Roman Space Telescope?
💡 Explanation:The Nancy Grace Roman Space Telescope is designed to settle essential questions in the areas of dark energy, dark matter, and exoplanets using a field of view 100 times larger than the Hubble Space Telescope.
#2
By Ahmed Akber
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Medium
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Fact Checked
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30 Aug 2026
What did Edwin Hubble’s 1929 observation of galactic redshift primarily prove about the universe?
💡 Explanation:Hubble discovered that distant galaxies are moving away from Earth at speeds proportional to their distance, providing the first evidence that the universe is expanding.
#3
By Ahmed Akber
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Medium
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Fact Checked
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30 Jul 2026
What core principle of the Steady State theory was directly contradicted by the discovery of the Cosmic Microwave Background?
💡 Explanation:The discovery of the Cosmic Microwave Background (CMB) provided evidence of a hot, dense early universe, disproving the Steady State theory's requirement that the universe maintains a constant density via the continuous creation of matter.
#4
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.
#5
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.
#6
By Kalsoom Tahir
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Medium
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15 Feb 2026
In exoplanetary science, what defines a ‘Super-Earth’?
💡 Explanation:Super-Earths are a category of exoplanets characterized by being rocky, similar to Earth in composition, but with a mass ranging between approximately two and ten times that of Earth. They are distinct from Mini-Neptunes, which are gaseous and smaller than Neptune.
#7
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.
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