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Venus Roman Goddess of Love Venus
Venus Roman Goddess of Love Venus

OurSolarSystem_part1
OurSolarSystem_part1

... Jupiter, the fifth planet from the Sun, is the largest planet in our solar system. Jupiter is so big that over 1,000 planets the size of Earth could fit into it. It has over 60 moons and 2 rings. Can life exist on Jupiter's moon, Europa? ...
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SCI 103
SCI 103

... 18. The Universal Gravitational constant G is an extremely small number equal to 6.6710-11 in mks units. What does it mean that G is so small? What would the universe, or daily life, be like if G were a number closer to one? Answer in a few sentences below. ...
Some 250 years ago, the philosopher Immanuel Universal
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... in this artist’s impression. The Kepler space telescope (left) could yield even more. ...
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... The Solar System • Looking at the Solar System Data table, most of the planets have fairly circular orbits (low eccentricities) with the exception of Mercury. ...
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... most stable burning object in Milky Way galaxy with a very low .1% variance (over 11 years span), so small it has no impact on Earth's climate. The search for a very stable burning star like our sun is called a solar twin. An identical solar twin has yet to be found, closest is stars with about 3% v ...
Kylie and Cody
Kylie and Cody

... the sun, revolved around the Earth.  Astronomers once thought that planetary orbits were circular and that the sun was in the center. Kepler showed that the orbits are elliptical. The sun is not at the center but slightly to one side. ...
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What are stars?

The History of Astronomy
The History of Astronomy

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Origin of Ocean

... Milky Way Galaxy Milky Way Galaxy is 100 million light in diameter  Our galaxy contains roughly 400 billion stars  Sun is a very typical star located in one of the arms of the Milky Way Galaxy  Other planetary systems have been found in our galaxy ...
Origins of Earth
Origins of Earth

... Milky Way Galaxy Milky Way Galaxy is 100 million light in diameter  Our galaxy contains roughly 400 billion stars  Sun is a very typical star located in one of the arms of the Milky Way Galaxy  Other planetary systems have been found in our galaxy ...
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... The information in the table tells us that animals hear different sounds. Which animal hears the fewest sounds? A. bat B. dog C. elephant D. frog 15. In April, when it is springtime in the Northern Hemisphere, which season is it in the Southern Hemisphere? A. winter B. spring C. summer D. fall 16. J ...
The Solar System 2015
The Solar System 2015

... Jupiter and Saturn are gaseous giants. We call them Jupiter-type planets also. Their relatively small cores probably consist of rock and ice, the extended mantles are made of metallic and molecular hydrogen and helium. All giant planets have rings (even thought only rings of Saturn are easily obser ...
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CLOZE-ing in on Science!

Habitable zone - Penn State University
Habitable zone - Penn State University

... preferred time and location within the galaxy for habitable planets to exist • Stars that are too close to the center of the galaxy are subject to frequent nearcollisions and more supernovae and gamma ray bursts • Stars that are too far out in the galaxy (or that evolved too early in its history) ma ...
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... Venus, Mars, Jupiter, Saturn. Over a period of weeks and months they move among the constellations • Mercury: never farther than 27 degrees from the sun, on morning or evening side • Venus: never farther than 47 degrees from the sun, on morning or evening side • Mars, Jupiter, Saturn: move eastward ...
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Motions of the Planets: Not the same as Stars!

... Venus, Mars, Jupiter, Saturn. Over a period of weeks and months they move among the constellations •  Mercury: never farther than 27 degrees from the sun, on morning or evening side •  Venus: never farther than 47 degrees from the sun, on morning or evening side •  Mars, Jupiter, Saturn: move eastwa ...
Largest moon in the solar system
Largest moon in the solar system

... Large rotating hurricane called the Great Red Spot. (2 Earth sizes) 4 faint rings in orbit. 2.5 times greater in mass than all of the other planets combined. Has at least 63 natural satellites, 4 largest are known as the Galilean Moons. The Great Red Spot has been observed for over 300 years! ...
Our Solar System - After School Astronomy Clubs
Our Solar System - After School Astronomy Clubs

... Jupiter, the fifth planet from the Sun, is the largest planet in our solar system. Jupiter is so big that over 1,000 planets the size of Earth could fit into it. It has over 60 moons and 2 rings. Can life exist on Jupiter's moon, Europa? ...
Powerpoint Presentation (large file)
Powerpoint Presentation (large file)

... • Like the Sun and Moon, the planets move on the celestial sphere with respect to the background of stars • Most of the time a planet moves eastward in direct motion, in the same direction as the Sun and the Moon, but from time to time it moves westward in retrograde motion ...
Click here to see all test questions at once.
Click here to see all test questions at once.

Life in the Universe
Life in the Universe

... maybe one or two) are gaseous giants and are unlikely to have surface life. ...
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... The earliest days of astronomy: 1. It was dark at night! No artificial lighting. 2. The sky is very impressive. 3. Certain behaviors and patterns became obvious: •The concept of the celestial sphere. The sky appeared to be a huge sphere turning on an axis. There was a north and south pole and an eq ...
688 Chapter 21 Review - District 196 e
688 Chapter 21 Review - District 196 e

... a. Calculate the intensity (w/m2) of sunlight at the top of Earth’s atmosphere. For the Sun, L = 3.8 × 1026 watts and the distance between the sun and Earth is 150 × 109 meters. b. Suppose Earth were orbiting Alpha Centaurii A, the nearest star to Earth. This star has a luminosity of 5.7 × 1026 watt ...
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Rare Earth hypothesis



In planetary astronomy and astrobiology, the Rare Earth Hypothesis argues that the origin of life and the evolution of biological complexity such as sexually reproducing, multicellular organisms on Earth (and, subsequently, human intelligence) required an improbable combination of astrophysical and geological events and circumstances. The hypothesis argues that complex extraterrestrial life is a very improbable phenomenon and likely to be extremely rare. The term ""Rare Earth"" originates from Rare Earth: Why Complex Life Is Uncommon in the Universe (2000), a book by Peter Ward, a geologist and paleontologist, and Donald E. Brownlee, an astronomer and astrobiologist, both faculty members at the University of Washington.An alternative view point was argued by Carl Sagan and Frank Drake, among others. It holds that Earth is a typical rocky planet in a typical planetary system, located in a non-exceptional region of a common barred-spiral galaxy. Given the principle of mediocrity (also called the Copernican principle), it is probable that the universe teems with complex life. Ward and Brownlee argue to the contrary: that planets, planetary systems, and galactic regions that are as friendly to complex life as are the Earth, the Solar System, and our region of the Milky Way are very rare.
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