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Related Concept Videos

Plasmodesmata02:32

Plasmodesmata

The organs in a multicellular organism’s body are made up of tissues formed by cells. To work together cohesively, cells must communicate. One way that cells communicate is through direct contact with other cells. The points of contact that connect adjacent cells are called intercellular junctions.
Acceleration due to Gravity on Other Planets01:24

Acceleration due to Gravity on Other Planets

The gravitational acceleration of an object near the Earth's surface is called the acceleration due to gravity. It can be measured by conducting simple experiments on Earth. However, such an experiment is impossible to conduct on the surface of other planets.
Astronomical observations are thus used to measure the acceleration due to gravity on other planets. This can be determined by observing the effect of a planet's gravity on objects close to it. The crucial factor that helps in this...
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,...
Kepler's Second Law of Planetary Motion01:29

Kepler's Second 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. 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.
While in an elliptical orbit, the total energy of the planet is conserved. Therefore, the planet slows down when it is at apogee and...
Kepler's Third Law of Planetary Motion01:18

Kepler's Third 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. 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...
Plasmodesmata01:20

Plasmodesmata

In a multicellular organism, cells must communicate to work together in a coordinated manner. One way that cells communicate is through direct contact with other cells. The points of contact that connect adjacent cells are called intercellular junctions.
Intercellular junctions are a feature of fungal, plant, and animal cells. However, different types of junctions are found in different kinds of cells. Intercellular junctions found in animal cells include tight junctions, gap junctions, and...

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Harvesting Sperm and Artificial Insemination of Mice
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Dunes on Pluto.

Matt W Telfer1, Eric J R Parteli2, Jani Radebaugh3

  • 1School of Geography, Earth and Environmental Sciences, Plymouth University, Drake Circus, Plymouth, Devon PL4 8AA, UK. matt.telfer@plymouth.ac.uk.

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PubMed
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This summary is machine-generated.

Pluto

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Area of Science:

  • Planetary Science
  • Geology
  • Atmospheric Science

Background:

  • Pluto's surface geology is surprisingly diverse.
  • The influence of its thin atmosphere on landscape formation is not well understood.

Purpose of the Study:

  • To investigate the origin of regularly spaced, linear ridges on Pluto's surface.
  • To determine the role of atmospheric processes in shaping Pluto's landscape.

Main Methods:

  • Analysis of New Horizons spacecraft imagery.
  • Morphological and distributional analysis of surface features.
  • Comparison with atmospheric and geological models.

Main Results:

  • Linear ridges identified as transverse dunes.
  • Dune wavelength suggests formation from methane ice particles.
  • Evidence of recent geological activity.

Conclusions:

  • Pluto's dunes indicate active aeolian processes.
  • Methane ice particles are transported by moderate winds.
  • These dunes formed recently, highlighting ongoing geological dynamics.