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ANSWER
ANSWER

... ANSWER: Jupiter, Saturn, Uranus, Neptune 6. What is the difference between the sizes of the terrestrial and gas giant planets? ANSWER: Terrestrial planets are smaller than gas giant planets. 7. What is the difference between the distance between the terrestrial and gas giant planets? ANSWER: The dis ...
No. 35 - Institute for Astronomy
No. 35 - Institute for Astronomy

... solar system because they reflect light from the Sun. Imaging the reflected light of exoplanets is currently impossible because the light reflected by the planets is swamped by the glare of their host stars, which are about a billion times brighter. However, when gasgiant planets are young, they als ...
29 Jan: Maps of the Sky
29 Jan: Maps of the Sky

... First announcement: full moon tonight at 12:18 AM ...
ppt
ppt

... the heavens and the earth” refers to a long period of time that the universe we see in the heavens developed according to God’s design. Apparently the fine tuning of the laws of nature, the physical constants, the initial density and rate of expansion of the universe God established was sufficient o ...
May 2013 - Joliet Junior College
May 2013 - Joliet Junior College

... and the moon, and will be easily visible during the summer. The sun passed Mars during April and by the end of May Mars will be visible before sunrise. Mars will be in the early morning sky throughout the summer - moving farther from the sun each day. Mercury orbits behind the sun on May 11th and wi ...
A tour of the solar system.
A tour of the solar system.

... expelling matter which accreted to form planets. Forest Moulton & Thomas Chamberlin (1900) – A star passed close to Sun, pulling away huge filaments of material. Problems: such events are extremely rare. Also material is so hot that it would dissipate into space and not accrete. ...
Your Place in Space and Time
Your Place in Space and Time

... occurs at the stroke of midnight on January 1, and the present is the last instant of December 31. ...
Earth, Moon, Sun, and Stars
Earth, Moon, Sun, and Stars

... us make sense of what we see in the sky, both by day and by night. An understanding of our nearby space neighborhood can also inspire future exploration deeper into space, which may someday even include the discovery of life on distant planets. Key words: air, atmosphere, calendar, circle, crescent, ...
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... 3. A binary system has a period of about 100 years and an average separation of 30 AU. Its combined mass is about 3 solar masses. 4. In a sample of nearby stars, about what percentage will lie on the main sequence? 90% 5. In what part of the H-R diagram do white dwarfs lie? Upper right 6. This stat ...
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... It takes less than 88 Earth days for Mercury to orbit around the sun which is its year. Because of a lack of an atmosphere, the temperature rises above 800°F while on the dark side it falls rapidly to -300°F. Mercury rotates slowly on its axis. It completes one rotation every 59 Earth days which is ...
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Introduction to the sky
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... If we draw a line from the zenith through a celestial object and extend that line to the horizon, we obtain the azimuth angle of the object. By convention, the north point on the horizon has azimuth 0 degrees, the east point has azimuth 90 degrees, the south point has azimuth 180 degrees, and the w ...
PDF version - Caltech Astronomy
PDF version - Caltech Astronomy

... 왘 The planets move in elliptical orbits—rather than in circles and epicycles. 왘 The rate at which a planet sweeps out area within its orbital ellipse is constant. 왘 The periods of the planetary orbits increase as the 3/2 power of their semimajor axes. The last of these findings was the first quantit ...
Introduction to the sky
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... If we draw a line from the zenith through a celestial object and extend that line to the horizon, we obtain the azimuth angle of the object. By convention, the north point on the horizon has azimuth 0 degrees, the east point has azimuth 90 degrees, the south point has azimuth 180 degrees, and the w ...
The Official Magazine of the University of St Andrews Astronomical Society
The Official Magazine of the University of St Andrews Astronomical Society

... the Bulgarian Under-21 football team! (It’s a hard life representing the society, but someone has to do it…) However we hadn’t ventured so far from home just to spend a night on the town with some dashing young Bulgarians, and so we got some much needed sleep before the conference the next day. On ...
Earth In Space - Hicksville Public Schools / Homepage
Earth In Space - Hicksville Public Schools / Homepage

... a star that remains stationary in the night sky found directly above the north pole axis. ...
Tick Bait`s Universe Scavenger Hunt – “Going UP”
Tick Bait`s Universe Scavenger Hunt – “Going UP”

... 5. The inner planets are all made up of rock, while the outer planets are mostly just ________________________________________ . 6. True or False: The edge of our solar system stops at the orbits of Neptune and Pluto. True ...
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... Hoyle and others developed a Steady State Universe model to allow for expansion and still keep the universe eternal. ...
Newton*s Theory of Gravity and Planetary Motion
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... • Ptolemy (Alexandrian Greek) 85-65AD Heliocentric Viewpoints • Aristarchus (Greek)310-230 BC • Copernicus (Poland and Italy) 1473-1543 • Galileo Galilei (Italian) 1564-1642 ...
Asteroids
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... comet’s tail. The tail looks like hair; in fact, the name comet means “long– haired star” in Greek. A comet’s tail can be hundreds of millions of kilometers long and stretch across most of the sky. The material is stretched out very thinly, however, so there isn’t much mass in a comet tail. In 1705, ...
PDF format - Princeton University Press
PDF format - Princeton University Press

... circles passing under the earth, which is freely suspended in space. For Anaximenes the earth is still flat but, instead of resting on nothing, it is supported by air. The sun, the moon, and the planets are all made of fire, and they ride on the air because of their breadth. The sun derives its heat ...
ppt - Faculty Virginia
ppt - Faculty Virginia

... behaves more like a star near the north celestial pole (more like a circumpolar star) – so it is above the horizon much more than 12 hours. ...
Brownies + Earth Day
Brownies + Earth Day

... The area of the earth is almost 200 million square miles.  Earth travels through space at 66,700 miles per hour.  Earth's oceans are an average of 2 Miles deep.  Earth's rotation on its axis makes a day at 24 hours...  Earth's orbit around the sun makes a year at nearly 365 and 1/2 days   Earth is t ...
History of Astronomy
History of Astronomy

... geocentric model in which each celestial object was mounted on its own revolving transparent sphere with its own separate tilt  The faster an object moved in the sky, the smaller was its corresponding sphere  This simple geocentric model could not explain retrograde motion without appealing to clu ...
Chapter 1
Chapter 1

... Revolution – to go around in the orbit. Rotation – to spin around an axis. The Moon revolves once in about 29 days. The Moon rotates once in exactly the same time. We see only one side of the Moon. The side we don’t see is called the “dark side”. ...
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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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