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Ch.10 Stellar old age
Ch.10 Stellar old age

... • H fusion is faster because C, N and O act as catalysts • Same net result: 4 H become 1 He. • No total gain or loss of C, N, O Question: How does energy produced by CNO cycle compare to PP chain? ...
TOC two
TOC two

... dark areas and younger light areas. Unlike craters on rocky worlds, such as Earth’s moon, Ganymede’s craters have flat floors and sagging walls because of slowly flowing ice that is smoothing the moon’s surface. The largest cratered area is Galileo Regio. This young terrain is striped by parallel gr ...
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1698 - Lunar and Planetary Institute

... Kuiper Belt objects show that the four giant planets, especially Neptune and Jupiter, impose distinct and dramatic signatures on the overall distribution of Kuiper belt dust particles. The signatures are very similar to those observed in Epsilon Eridani. Numerical simulations of dust particles in Ep ...
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exercise 2

... dark areas and younger light areas. Unlike craters on rocky worlds, such as Earth’s moon, Ganymede’s craters have flat floors and sagging walls because of slowly flowing ice that is smoothing the moon’s surface. The largest cratered area is Galileo Regio. This young terrain is striped by parallel gr ...
The Sun
The Sun

... dark areas and younger light areas. Unlike craters on rocky worlds, such as Earth’s moon, Ganymede’s craters have flat floors and sagging walls because of slowly flowing ice that is smoothing the moon’s surface. The largest cratered area is Galileo Regio. This young terrain is striped by parallel gr ...
Word version with live links
Word version with live links

... is changing our view on that, as it is on the Moon which I have not mentioned here much because it is a satellite orbiting a planet even though it is not far off the size of Pluto which for some inexplicable reason has recently been downgraded from planet to object. Were the Plutonians advised of th ...
Kepler`s Third Law
Kepler`s Third Law

... In 1610, Galileo reported in a book that with his telescope he could see many more stars than he could with his unaided eye. He saw individual stars that make up the Milky way, described views of the Moon, including the discovery of mountains, craters and the relatively dark “seas.” Very important w ...
Understanding the Solar System
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... to maintain life! It is made up of 78% nitrogen, 21% oxygen, and 1% of other substances. Our Earth travels at about 67,000 miles per hour. The Earth also has 1 moon. Mars: Mars is the fourth planet from the sun. It is known as the red planet, because the rocks, soil, and sky have a red tint. Mars wa ...
Microsoft Word Document
Microsoft Word Document

Planets and Stars Key Vocabulary: Comparing and Contrasting
Planets and Stars Key Vocabulary: Comparing and Contrasting

... Why are some constellations observed during some seasons, but not during other seasons? Changes in the locations of constellations during the night are due to the rotation of Earth on its axis. - Because stars are so far away from us, changes in their positions are barely noticeable; thus, constella ...
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... 5. Identify How is Triton different from most other planets in the solar system? 6. Describe How do scientists think Saturn's rings formed? ...
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... The first planet orbiting a star other than our Sun (or 'exoplanet') was discovered in 1992, orbiting an odd type of star known as a pulsar. It wasn't until three years later that the next exoplanet was discovered, this time around a star similar to our Sun. Since then the number of exoplanets we ha ...
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...  Size is the most obvious difference between the terrestrial and the Jovian planets.  The diameter of the largest terrestrial planet, Earth, is only onequarter the diameter of the smallest Jovian planet, Neptune.  The Jovian planets are often called giants. (also called the outer planets).  The ...
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... • Within the disk, material is constantly colliding with one another. If the collisions are not too violent material may stick together. • In the outer parts of the Solar Nebula the planets become large enough to have a significant gravitational pull and collect gas around them. • Planets in the inn ...
Celestial Sphere - Otterbein University
Celestial Sphere - Otterbein University

... • The Earth’s rotation axis is tilted 23½ degrees with respect to the plane of its orbit around the sun (the ecliptic) • It is fixed in space  sometimes we look “down” onto the ecliptic, sometimes “up” to it ...
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... Humans have always wondered if life exists elsewhere in the universe. Such life could take many forms, including some very different from our own, but because we only have information about Earth-life (carbon-based organisms) we may as well start by looking for life like us. This means we can test n ...
Apophis - Killer Asteroid?
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... The value of the constant G in Newton’s formula has been measured to be G = 6.67 x 10 –11 m3/(kg s2) This constant is believed to have the same value everywhere in the Universe ...
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... The Moons of Other Planets •The moons of other planets range in size from very small to as large as terrestrial planets. •Venus and Mercury have no moons. •All of the outer planets have multiple moons. •Some moons orbit their planets backwards! •Moons may be some of the most bizarre and interesting ...
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Study Guide for 1ST Astronomy Exam

...  Write the planets in order of increasing distance from the Sun,  Define a dwarf planet,  Identify dwarf planets in the solar system,  Using a ratio determine how much larger one object is compared to another given their diameters,  Convert AU into kilometers and kilometers into AU. Unit 2: Bey ...
Math Notes - UNC Physics and Astronomy
Math Notes - UNC Physics and Astronomy

...  We continue to discover new asteroids, both in and out of the asteroid belt, to the present day.  Planetary moons  We continue to discover new moons around Jupiter, Saturn, Uranus, and Neptune to the present day.  Neptune (1846) 20th Century  Pluto (1938)  Pluto is the first discovered member ...
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Revision Pearson Chapter 9 Answers File

... Planets reflect sunlight whereas stars make their own light (via nuclear reactions). Planets are much smaller than stars. Planets orbit a star whereas stars usually don’t orbit anything. ...
The Discovery of Planets beyond the Solar System
The Discovery of Planets beyond the Solar System

... . smallest mass of a planet is not well defined, for some astronomers it is Pluto’s mass, which is a hundred thousand times smaller than Jupiter’s. ...
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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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