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1. - TeacherWeb
1. - TeacherWeb

... 〉 How are stars formed? 〉 Stars are formed from clouds of dust and gas, or nebulas, and go through different stages as they age. • star: a large celestial body that is composed of gas and emits light ...
Detecting the glint of starlight on the oceans of distant planets
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Astrophysics
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Formation of the Solar System Section 28.1
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lab 11 only - Penn State University

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... solar system’s origin, with mixed results. All agree that Earth, Mercury, Venus, and Mars — the so-called terrestrial planets — formed as progressively larger rocky bodies banged together. But theories now in vogue have trouble accounting for the solar system’s massive gas giants, Jupiter and Saturn ...
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... Saturn’s Speed of Rotation and Solar Orbit Saturn takes 29.5 Earth years to orbit the Sun. Like Jupiter, it has a short “day”— it rotates on its axis in 10 hours, 39 minutes. Also like Jupiter, Saturn experiences differential rotation. The figure just given for its day refers to its rate of rotatio ...
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Adult education at Scienceworks
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The Stellar Dynamo - Academic Program Pages
The Stellar Dynamo - Academic Program Pages

... are often seen bright areas called plages (after the French word for “beach”). The magnetic-field lines tend to emerge from the surface at one spot to reenter the sun at another, linking the spots into pairs that resemble the two poles of a bar magnet that is oriented roughly east-west. At the start ...
The Stellar Dynamo - Department of Atmospheric Sciences
The Stellar Dynamo - Department of Atmospheric Sciences

... are often seen bright areas called plages (after the French word for “beach”). The magnetic-field lines tend to emerge from the surface at one spot to reenter the sun at another, linking the spots into pairs that resemble the two poles of a bar magnet that is oriented roughly east-west. At the start ...
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Equilibrium Tides

... At the center of the earth, there is an exact balance between the gravitational attraction of the moon and the centrifugal force of earth’s revolution. The former is given by Newton’s law of gravitation, in which the force is proportional to the product to the masses of the earth and the moon, and i ...
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Geocentric model



In astronomy, the geocentric model (also known as geocentrism, or the Ptolemaic system) is a description of the cosmos where Earth is at the orbital center of all celestial bodies. This model served as the predominant cosmological system in many ancient civilizations such as ancient Greece including the noteworthy systems of Aristotle (see Aristotelian physics) and Ptolemy. As such, they believed that the Sun, Moon, stars, and naked eye planets circled Earth.Two commonly made observations supported the idea that Earth was the center of the Universe. The stars, the sun, and planets appear to revolve around Earth each day, making Earth the center of that system. The stars were thought to be on a celestial sphere, with the earth at its center, that rotated each day, using a line through the north and south pole as an axis. The stars closest to the equator appeared to rise and fall the greatest distance, but each star circled back to its rising point each day. The second observation supporting the geocentric model was that the Earth does not seem to move from the perspective of an Earth-bound observer, and that it is solid, stable, and unmoving.Ancient Roman and medieval philosophers usually combined the geocentric model with a spherical Earth. It is not the same as the older flat Earth model implied in some mythology, as was the case with the biblical and postbiblical Latin cosmology. The ancient Jewish Babylonian uranography pictured a flat Earth with a dome-shaped rigid canopy named firmament placed over it. (רקיע- rāqîa').However, the ancient Greeks believed that the motions of the planets were circular and not elliptical, a view that was not challenged in Western culture until the 17th century through the synthesis of theories by Copernicus and Kepler.The astronomical predictions of Ptolemy's geocentric model were used to prepare astrological and astronomical charts for over 1500 years. The geocentric model held sway into the early modern age, but from the late 16th century onward was gradually superseded by the heliocentric model of Copernicus, Galileo and Kepler. There was much resistance to the transition between these two theories. Christian theologians were reluctant to reject a theory that agreed with Bible passages (e.g. ""Sun, stand you still upon Gibeon"", Joshua 10:12 – King James 2000 Bible). Others felt a new, unknown theory could not subvert an accepted consensus for geocentrism.
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