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Related Concept Videos

Density00:56

Density

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Density is an important characteristic of substances, crucial in determining whether an object sinks or floats in a fluid. Its SI unit is kg/m3, and its cgs unit is g/cm3. The density of an object helps in identifying its composition, and also reveals information about the phase of the matter and its substructure. The densities of liquids and solids are roughly comparable, consistent with the fact that their atoms are in close contact. However, gases have much lower densities than liquids and...
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Density and Archimedes' Principle01:05

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When a lump of clay is dropped into water, it sinks. But if the same lump of clay is molded into the shape of a boat, it starts to float. Because of its shape, the clay boat displaces more water than the lump and experiences a greater buoyant force, even though its mass is the same. The same holds true for steel ships. The average density of an object majorly determines if the object will float. If an object's average density is less than that of the surrounding fluid, it will float. The...
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Gravity between Spherical Bodies01:27

Gravity between Spherical Bodies

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Newton's law of gravitation describes the gravitational force between any two point masses. However, for extended spherical objects like the Earth, the Moon, and other planets, the law holds with an assumption that masses of spherical objects are concentrated at their respective centers.
This assumption can be proved easily by showing that the expression for gravitational potential energy between a hollow sphere of mass (M) and a point mass (m) is the same as it would be for a pair of extended...
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Acceleration due to Gravity on Other Planets01:24

Acceleration due to Gravity on Other Planets

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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...
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Kepler's First Law of Planetary Motion01:10

Kepler's First Law of Planetary Motion

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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.
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,...
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Kepler's Third Law of Planetary Motion01:18

Kepler's Third Law of Planetary Motion

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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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Simulation of the Planetary Interior Differentiation Processes in the Laboratory
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Simulation of the Planetary Interior Differentiation Processes in the Laboratory

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An Earth-sized planet with an Earth-like density.

Francesco Pepe1, Andrew Collier Cameron, David W Latham

  • 1Observatoire Astronomique de l'Université de Genève, 51 chemin des Maillettes, 1290 Versoix, Switzerland.

Nature
|November 1, 2013
PubMed
Summary
This summary is machine-generated.

Kepler-78b, an Earth-sized exoplanet, has a density similar to Earth, suggesting a rocky and iron composition. This finding helps determine the composition of small exoplanets discovered by the Kepler spacecraft.

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Area of Science:

  • Exoplanetary Science
  • Planetary Geology

Background:

  • Thousands of Earth-sized exoplanets have been detected by NASA's Kepler spacecraft.
  • The bulk composition of these exoplanets remains largely unknown due to mass determination challenges.

Purpose of the Study:

  • To determine the mass and density of the Earth-sized exoplanet Kepler-78b.
  • To infer the bulk composition of Kepler-78b and compare it to Earth.

Main Methods:

  • Utilized transit photometry data from the Kepler spacecraft to identify Kepler-78b.
  • Employed radial velocity measurements to determine the mass of Kepler-78b.

Main Results:

  • Kepler-78b has a radius of 1.16 times that of Earth.
  • The mass of Kepler-78b was determined to be 1.86 Earth masses.
  • Kepler-78b exhibits a mean density of 5.57 g cm⁻³, comparable to Earth's density.

Conclusions:

  • Kepler-78b is likely composed primarily of iron and rock, similar to Earth.
  • This study provides crucial data for understanding the composition of Earth-sized exoplanets.