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Related Concept Videos

Kepler's First Law of Planetary Motion01:10

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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.
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On the other hand,...
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Kepler's Second Law of Planetary Motion01:29

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In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. His first law states that all planets orbit the Sun in an elliptical orbit, with the Sun at one of the ellipse's foci. Therefore, the distance of a planet from the Sun varies throughout its revolution around the Sun.
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In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. In 1909, he formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe. However, in 1918, he published his third law of planetary motion, which gives a precise mathematical relationship between a planet's average distance from the Sun and the amount of time it takes to revolve around the Sun. It...
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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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Reduced Mass Coordinates: Isolated Two-body Problem01:12

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In classical mechanics, the two-body problem is one of the fundamental problems describing the motion of two interacting bodies under gravity or any other central force. When considering the motion of two bodies, one of the most important concepts is the reduced mass coordinates, a quantity that allows the two-body problem to be solved like a single-body problem. In these circumstances, it is assumed that a single body with reduced mass revolves around another body fixed in a position with an...
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Newman Projections02:06

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Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
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The Pluto system: Initial results from its exploration by New Horizons.

S A Stern1, F Bagenal2, K Ennico3

  • 1Southwest Research Institute, Boulder, CO 80302, USA. astern@boulder.swri.edu.

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Area of Science:

  • Planetary Science
  • Astronomy
  • Geology

Background:

  • The Pluto system was explored by NASA's New Horizons spacecraft in 2015.
  • Pluto exhibits diverse surface features, including varied terrain ages, colors, and compositions.

Purpose of the Study:

  • To analyze the geological and atmospheric characteristics of Pluto and its moons.
  • To understand the processes that maintain geological activity on small planets.

Main Methods:

  • Analysis of data from NASA's New Horizons spacecraft flyby.
  • Remote sensing of Pluto's surface, atmosphere, and moons.

Main Results:

  • Pluto shows evidence of a water-ice crust, young surface units, ice convection, wind streaks, volatile transport, and glacial flow.
  • Pluto's atmosphere is extended, with hydrocarbons, a haze layer, and low surface pressure.
  • Charon exhibits tectonics and a heterogeneous crust; its north pole has dark terrain.
  • Satellites Hydra and Nix have unexpectedly high albedos.

Conclusions:

  • Pluto's complex geology and sustained activity challenge existing models of small planet evolution.
  • The exploration of the Pluto system provides new insights into the diversity of planetary bodies.