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Related Concept Videos

Rocket Propulsion in Empty Space - I01:13

Rocket Propulsion in Empty Space - I

The driving force for the motion of any vehicle is friction, but in the case of rocket propulsion in space, the friction force is not present. The motion of a rocket changes its velocity (and hence its momentum) by ejecting burned fuel gases, thus causing it to accelerate in the direction opposite to the velocity of the ejected fuel. In this situation, the mass and velocity of the rocket constantly change along with the total mass of ejected gases. Due to conservation of momentum, the rocket's...
Rocket Propulsion In Empty Space - II01:12

Rocket Propulsion In Empty Space - II

The motion of a rocket is governed by the conservation of momentum principle. A rocket's momentum changes by the same amount (with the opposite sign) as the ejected gases. As time goes by, the rocket's mass (which includes the mass of the remaining fuel) continuously decreases, and its velocity increases. Therefore, the principle of conservation of momentum is used to explain the dynamics of a rocket's motion. The ideal rocket equation gives the change in velocity that a rocket experiences by...
Schwarzschild Radius and Event Horizon01:21

Schwarzschild Radius and Event Horizon

No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
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Radiation Pressure: Problem Solving01:09

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The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
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In three-dimensional analytic geometry, a line can be fully described using vector equations when both a point on the line and its direction are known. This approach has practical applications in fields such as engineering and surveying, where precise spatial modeling is essential. For instance, a laser beam from a surveying instrument directed across a construction site can be modeled mathematically as a line using vectors.Let the laser beam originate from a known point P₀, represented by the...

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Related Experiment Video

Updated: Jun 24, 2026

Bringing the Visible Universe into Focus with Robo-AO
10:35

Bringing the Visible Universe into Focus with Robo-AO

Published on: February 12, 2013

Star dust.

E P Ney

    Science (New York, N.Y.)
    |February 11, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Stars release refractory dust grains into space, forming interstellar dust and potentially planetary systems. This dust, including silicates found in comets, originates from stellar atmospheres and novae.

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    Scattering And Absorption of Light in Planetary Regoliths
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    Last Updated: Jun 24, 2026

    Bringing the Visible Universe into Focus with Robo-AO
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    Published on: February 12, 2013

    Experimental Methods of Dust Charging and Mobilization on Surfaces with Exposure to Ultraviolet Radiation or Plasmas
    07:54

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    Scattering And Absorption of Light in Planetary Regoliths
    11:34

    Scattering And Absorption of Light in Planetary Regoliths

    Published on: July 1, 2019

    Area of Science:

    • Astronomy and Astrophysics
    • Cosmic Dust Formation
    • Stellar Evolution

    Background:

    • Infrared astronomy reveals stars as major sources of refractory grains.
    • These grains, including metallic silicates and carbonaceous materials, are expelled into interstellar space.
    • Interstellar dust composition suggests common origins with materials in planetary systems.

    Purpose of the Study:

    • To investigate the role of stars in producing interstellar dust.
    • To explore the link between stellar dust production and planetary system formation.
    • To analyze the composition of dust grains from various stellar sources.

    Main Methods:

    • Observational analysis of infrared emissions from stars.
    • Morphological studies of dust-enshrouded stars.
    • Compositional analysis of dust grains from stellar atmospheres and novae shells.

    Main Results:

    • Oxygen-rich stars inject metallic silicates; carbon stars produce carbon refractories.
    • A significant portion of interstellar dust may originate from stellar outflows.
    • Some infrared stars exhibit morphologies indicative of nascent planetary systems or nebulae.

    Conclusions:

    • Stars are primary producers of interstellar refractory grains.
    • Stellar dust ejection mechanisms contribute to galactic dust reservoirs.
    • The presence of similar silicates in comets supports their primeval solar nebula origin.