Interstellar Medium
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SteveO1
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ASTRONOMY
Interstellar Medium
Barnard 68
A cosmic shadow so dense it hides stars behind it in plain sight
3 days ago
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What key factor makes Barnard 68 an effective dark nebula that blocks starlight?
Its large size compared to other nebulae allows it to cover more stars.
Its high density and cold temperature create an opaque cloud of dust and gas.
It emits strong light that outshines the stars behind it, making them invisible.
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SteveO1
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Interstellar Medium
Giant Molecular Cloud
Turbulence and gravity duel within giant molecular clouds to ignite star birth
7 days ago
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What primary forces influence whether a region within a giant molecular cloud will form stars?
The competing effects of gravity pulling gas together and turbulence or magnetic fields resisting collapse
Only the temperature of the cloud determines star formation
Star formation depends solely on the presence of ionized gas
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SteveO1
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Interstellar Medium
Interstellar Cloud
Cosmic clouds are arenas where star birth and stellar death collide in a celestial tug-of-war
14 days ago
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What primary forces determine whether an interstellar cloud will collapse to form new stars or disperse?
The amount of dark matter within the cloud
The balance between gravitational attraction and radiation pressure from nearby stars
The cloud's magnetic field alone controls star formation
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Steeeve
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Interstellar Medium
Dark Nebulae
Dark nebulae are cosmic clouds so dense they block starlight, revealing hidden star nurseries
27 Jan 2026
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Why are dark nebulae primarily studied using radio and infrared astronomy rather than visible light?
Because their dense dust clouds block visible light but allow radio and infrared waves to pass through
Because dark nebulae emit strong visible light that interferes with observations
Because radio and infrared telescopes are more widely available than optical telescopes
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Astrophysics
Interstellar Medium
The interstellar medium is a vast, diffuse mixture of gas, dust, and radiation filling galaxies
26 Jan 2026
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How does the interstellar medium primarily influence the process of star formation within galaxies?
By emitting strong electromagnetic radiation that ignites star formation directly
By providing the gas and dust that collapse under gravity to form new stars
By acting as a vacuum that prevents any matter from accumulating to form stars
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Barnard 68
Barnard 68 is a cold, dark molecular cloud that completely obscures background stars
25 Jan 2026
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What characteristic of Barnard 68 causes it to appear as a dark patch against the background stars?
Its high density and opacity block the light from stars behind it.
It emits no light because it is composed entirely of dark matter.
It is too far away for its light to reach Earth.
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Rho Ophiuchi cloud complex
Rho Ophiuchi cloud complex offers a nearby glimpse into the birthplace of stars within a colorful nebula cluster
24 Jan 2026
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What makes the Rho Ophiuchi cloud complex particularly significant for studying star formation?
It is the largest known nebula in the Milky Way, providing a vast area for star formation studies.
It is located within the Solar System, making it directly accessible for spacecraft exploration.
It is one of the closest star-forming regions to the Solar System, allowing detailed observation of stellar birth processes.
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Molecular Cloud
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Molecular clouds serve as cosmic nurseries where stars are born from dense, cold gas and dust
22 Jan 2026
Molecular clouds serve as cosmic nurseries where stars are born from dense, cold gas and dust A molecular cloud, also known as a stellar nursery when star formation is active, is a dense and large...
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