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Related Concept Videos

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...
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 Gravitational Field - II01:03

Rocket Propulsion in Gravitational Field - II

A rocket's velocity in the presence of a gravitational field is decreased by the amount of force exerted by Earth's gravitational field, which opposes the motion of the rocket. If we consider thrust, that is, the force exerted on a rocket by the exhaust gases, then a rocket's thrust is greater in outer space than in the atmosphere or on a launch pad. In fact, gases are easier to expel in a vacuum.
A rocket's acceleration depends on three major factors, consistent with the equation for the...
Rocket Propulsion in Gravitational Field - I01:20

Rocket Propulsion in Gravitational Field - I

Rockets range in size from small fireworks that ordinary people use to the enormous Saturn V that once propelled massive payloads toward the Moon. The propulsion of all rockets, jet engines, deflating balloons, and even squids and octopuses are explained by the same physical principle: Newton's third law of motion. The matter is forcefully ejected from a system, producing an equal and opposite reaction on what remains.
The motion of a rocket in space changes its velocity (and hence its...
Kepler's First Law of Planetary Motion01:10

Kepler's First Law of Planetary Motion

In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. He formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe.
Polish astronomer Nikolaus Copernicus put forth a theory that stated a heliocentric model for the solar system. According to this heliocentric theory, all the planets, including Earth, orbit the Sun in circular orbits.
On the other hand,...
Energy of a Satellite in a Circular Orbit01:11

Energy of a Satellite in a Circular Orbit

Thousands of artificial satellites orbit the Earth every day at various distances from the Earth. Satellites that orbit the Earth below an altitude of 1,600 km are considered to be orbiting in low-Earth orbit (LEO). Research satellites and Earth observation satellites are usually placed in LEO, and mostly orbit the Earth in elliptical orbits. Navigation satellites are placed in medium-Earth orbit (MEO), ranging from 2,000 km to 36,000 km from the surface of the Earth. Meanwhile, communication...

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Related Experiment Video

Updated: May 27, 2026

Scattering And Absorption of Light in Planetary Regoliths
11:34

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Stardust in meteorites.

Andrew M Davis1

  • 1Department of the Geophysical Sciences, Enrico Fermi Institute, and Chicago Center for Cosmochemistry, 5734 South Ellis Avenue, Chicago, IL 60637, USA. a-davis@uchicago.edu

Proceedings of the National Academy of Sciences of the United States of America
|November 23, 2011
PubMed
Summary
This summary is machine-generated.

Stardust grains found in primitive meteorites and comets offer direct samples from pre-solar stars. Studying these grains refines our understanding of nucleosynthesis in stars like red giants and supernovae.

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Last Updated: May 27, 2026

Scattering And Absorption of Light in Planetary Regoliths
11:34

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

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

Published on: April 3, 2018

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System
09:44

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System

Published on: June 5, 2014

Area of Science:

  • * Astrochemistry and Cosmochemistry
  • * Stellar Evolution and Nucleosynthesis

Background:

  • * Primitive meteorites, interplanetary dust, and comets contain presolar dust grains.
  • * These grains originated from stars that existed before the formation of our solar system.
  • * Their discovery over twenty years ago opened new avenues for laboratory analysis.

Purpose of the Study:

  • * To analyze the properties of presolar stardust grains.
  • * To use these properties to constrain models of stellar nucleosynthesis.
  • * To understand the role of stars in recycling dust into the interstellar medium.

Main Methods:

  • * Laboratory analysis of presolar dust grains using modern analytical tools.
  • * Comparative study of grain properties with theoretical models of stellar nucleosynthesis.

Main Results:

  • * Presolar stardust grains provide direct evidence of stellar processes.
  • * Grain properties offer constraints on nucleosynthesis in red giant stars and supernovae.
  • * These studies enhance our understanding of dust formation and evolution in stars.

Conclusions:

  • * Presolar dust grains are invaluable samples for studying stellar evolution.
  • * They play a crucial role in the chemical enrichment of the interstellar medium.
  • * Continued analysis of stardust refines models of cosmic chemical evolution.