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REVIEW: Rotational Equilibrium (Chapter 11)
REVIEW: Rotational Equilibrium (Chapter 11)

... Thus it must the the “fault” of the potential energy. For the Universal Gravity force, we can derive from the integral definition that the potential energy is given by the formula ...
Chapter 2: The Solar System and Beyond
Chapter 2: The Solar System and Beyond

... time, called a lunar cycle, you see different portions of the daylight side of the Moon. The lunar cycle begins with new moon. During new moon, the Moon is between Earth and the Sun. Half of the Moon is lit by the Sun, but this half can’t be seen from Earth. For about two weeks after new moon, the p ...
Voyage of Discovery - MESSENGER Education
Voyage of Discovery - MESSENGER Education

... equator, and two Earth’s can comfortably fit inside a storm on Jupiter called the Great Red Spot. Pluto is the smallest planet and has the largest average distance from the Sun. Its basic properties—size, composition, orbit around the Sun—make it a poor fit into either the terrestrial or Jovian cate ...
Chapter 2
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Preview Sample 2
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... When we say that the universe is expanding, we mean that the average distance between galaxies is increasing with time. If the universe is expanding, then if we imagine playing time backward, we’d see the universe shrinking. Eventually, if we went back far enough in time, the universe would be compr ...
see figure - Georgia Southwestern State University
see figure - Georgia Southwestern State University

... Unlike stars, planets are close enough to us that they appear as tiny disks when viewed with telescopes, though we can’t quite see these disks with the naked eye. As the air moves around, even though the planets’ images move slightly, there are enough points on the image to make the average amount o ...
Lecture 8 - Kepler and Brahe
Lecture 8 - Kepler and Brahe

... observation: A conjunction of Jupiter and Saturn, in August 1563. He found that most of the existing almanacs were grossly in error. Even the recent tables of Copernicus were several days off in their prediction of the date of this event. This led him to decide to devote his life to making more accu ...
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... • All objects in the universe revolve around a “central fire” (not to be confused with the sun, which was a separate object in this picture), including the earth. In the Pythagorean picture, the central fire could never be seen. Notice that the “central fire” thus represents a mystical element in th ...
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... seen. Mercury, Venus, Mars, Jupiter and Saturn can be seen with the unaided eye or with binoculars. Pluto and other dwarf planets are not visible. ...
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... ozone destruction, directly by photolysis, but mostly indirectly due to the increased photochemical production of highly reactive radicals. For atmospheric compositions similar to the Earth’s, numerical simulations show a quantity of O increasing with the UV flux (Selsis, 2000). This property could ...
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... rhythm that has guided humans for thousands of years. The moon was likely formed after a Mars-sized body collided with Earth and the debris formed into the most prominent feature in our night sky. The gravity of the Moon, the pull which it exerts on the Earth, causes two high tides on the Earth ever ...
Atoms and Stars IST 3360 and IST 1990
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... • Hellenistic Period (after 323 BC) o Ptolemy (2nd cent AD) used new tools to simplify geocentric model of heavens • Epicycle (small sphere moved on larger sphere, planet on small sphere) • Eccentrics (circle displaced from earth) • Equant – point from which planet appeared to move at constant speed ...
MEarth
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... alignments could be confirmed or ruled out with archived or future high-resolution observations. Aside from these observational advantages, several developments in astrophysics point to exciting possibilities with M dwarfs. Firstly, the growing number of M-dwarf exoplanet discoveries, including the ...
discover the wonders above
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... COLDEST PLANET At -224°C Uranus is the coldest planet in our Solar System. Although Neptune is further away from the Sun it generates 2.61 times more energy than it receives, keeping it slightly warmer. ...
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... content in soil. Because people are made up in large part of water it is fair to presume these force effects on water also effect us. Apogee and Perigee The point that it is furtherest away from the earth is called Apogee, the closest Perigee. These events are considered by Biodynamic agricultural r ...
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... and type II migrates inward (Lin & Papaloizou 1986; Crida & Morbidelli 2007). Type-II migration of gas giants is significantly slower than the type-I migration of super-Earths (for super-Earths of ∼3 Earth masses or larger for traditional disk parameters). Of course, if there is enough time, then a g ...
júpiter, king of the moon
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... Io: is the closest to the giant Jupiter. It is 262,000 miles from Jupiter. It has a diameter of 2,258 miles. It orbits Jupiter once every 42, 5 hours. Its orbit is affected by the magnetic field of Jupiter and the proximity to Europe and Ganymede. It is rocky and permanently maintains intense volcan ...
The Long-Term Dynamical Evolution of Planetary Systems
The Long-Term Dynamical Evolution of Planetary Systems

... where d is the separation between two initially neighboring orbits. Regular orbits diverge from one another at a rate that is a power of time. Chaotic orbits diverge exponentially over long timespans, although they can be “sticky”, mimicking regular motion for extended time intervals. If the Solar S ...
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... equator to poleward heat flow could have been sustained (Barron 1983). Nevertheless, it is probable that the area of habitability is smaller on a fast-rotating planet than it is on a slow-spinning one. Secondly, we have the issue that pertains to the effect of tides on ocean mixing. It is well known ...
June, 2001 AAS poster - David P. Bennett
June, 2001 AAS poster - David P. Bennett

... about 1-day, and the lightcurves measured from a Paranal survey do not allow an unmistakable identification of the planetary nature of the signals nor a measurement of the planetary parameters. For a small subset of very short or high magnification events, it is possible to fully characterize the pl ...
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... Comet Shoemaker–Levy 9 was a comet that broke apart and collided with Jupiter in July 1994, providing the first direct observation of an extraterrestrial collision of Solar System objects. The impact of SL9 highlighted Jupiter's role as a "cosmic vacuum cleaner" for the inner Solar System. The plane ...
EX PLANET E - Institute of Physics
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Today in Astronomy 102: electron degeneracy pressure and white
Today in Astronomy 102: electron degeneracy pressure and white

... q From its observed color (blue-white), we know that its temperature is rather high: T = 29,200 K, compared to 5,800 K for the Sun and 10,000 K for Sirius A. q Its luminosity is only 0.003L , much less than that of Sirius A 13L . ...
cifutielu`s Astronomy Test 2014
cifutielu`s Astronomy Test 2014

... Kelvin and a luminosity 250,000 to 1,000,000 times that of the Sun’s. 2. _____ Pre-main sequence stars that are very young (less than a million years old) and have a mass that is between a fifth and a third of the Sun’s mass. 3. _____ Giants/supergiants whose periods range from 20 to 2000 days. 4. _ ...
Exploration géochimique du Système Solaire
Exploration géochimique du Système Solaire

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Definition of planet



The definition of planet, since the word was coined by the ancient Greeks, has included within its scope a wide range of celestial bodies. Greek astronomers employed the term asteres planetai (ἀστέρες πλανῆται), ""wandering stars"", for star-like objects which apparently moved over the sky. Over the millennia, the term has included a variety of different objects, from the Sun and the Moon to satellites and asteroids.By the end of the 19th century the word planet, though it had yet to be defined, had become a working term applied only to a small set of objects in the Solar System. After 1992, however, astronomers began to discover many additional objects beyond the orbit of Neptune, as well as hundreds of objects orbiting other stars. These discoveries not only increased the number of potential planets, but also expanded their variety and peculiarity. Some were nearly large enough to be stars, while others were smaller than Earth's moon. These discoveries challenged long-perceived notions of what a planet could be.The issue of a clear definition for planet came to a head in 2005 with the discovery of the trans-Neptunian object Eris, a body more massive than the smallest then-accepted planet, Pluto. In its 2006 response, the International Astronomical Union (IAU), recognised by astronomers as the world body responsible for resolving issues of nomenclature, released its decision on the matter. This definition, which applies only to the Solar System, states that a planet is a body that orbits the Sun, is massive enough for its own gravity to make it round, and has ""cleared its neighbourhood"" of smaller objects around its orbit. Under this new definition, Pluto and the other trans-Neptunian objects do not qualify as planets. The IAU's decision has not resolved all controversies, and while many scientists have accepted the definition, some in the astronomical community have rejected it outright.
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