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ppt
ppt

... resembles each other in mass and size more than any other planet-satellite pair in the solar system. • The distance is also the smallest, 19,640 km • Charon’s orbit period is the same as its rotational period, and also the same as the Pluto’s rotation period (6.3 days) – Both keep the same face towa ...
6 Scale Model of the Solar System
6 Scale Model of the Solar System

... Ground flour ...
6 Scale Model of the Solar System
6 Scale Model of the Solar System

... Ground flour ...
Return Visit Optimization for Planet Finding
Return Visit Optimization for Planet Finding

... than another. For example, at V = 5 better results are consistently achieved when returning after 1 estimated orbital period than after 1/2 period. • While in some cases returning a fixed time after initial detection produces better results than basing the re-visit time on the approximated orbital p ...
Astronomy Through the Ages: 2 Middle ages through Renaissance
Astronomy Through the Ages: 2 Middle ages through Renaissance

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... F. __________ ________ 1. _____ forces increase close to planet 2. Limit at which large moon torn apart G. Voyager discoveries 1. Thousands of ringlets (few gaps) 2. Only true gaps caused by “_______” 3. Moon _____ found in Encke gap H. Mysterious, thin, “braided” F-ring has 2 _________ moons on eac ...
Planetary Parachute
Planetary Parachute

... • travel the system from largest to smallest part or smallest to largest • travel the system at night (use a glow-in-the-dark ball) Activity #2: Meteor Shower The students shake the universe trying to keep the meteors from entering the planets’ orbits. Each time a meteor enters a planet, a point is ...
Volume 20 Number 10 September 2012
Volume 20 Number 10 September 2012

... same as the spectacular Perseids shower which peaks in mid-August and is one of the year's highlights. They both appear to radiate from the same constellation but are not related - they were formed by different comets. September has five minor showers with three or less per hour. ------------------- ...
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- Europhysics News

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oceanworlds1
oceanworlds1

... Space Agency is also gearing up for the Jupiter Icy Moon Explorer (JUICE) mission, which will tour Europa as well as Ganymede and Callisto. Even if none of the ocean worlds of our solar system contain life, perhaps icy planets in other systems will prove to be hospitable. Astronomers are currently f ...
Universal Gravitation
Universal Gravitation

... Maryn Smith, the winner of the National Geographic planetary mnemonic contest, has created a handy way to remember the planets and their order in distance from the sun. Her award-winning phrase is: My Very Exciting Magic Carpet Just Sailed Under Nine Palace Elephants. The 11 recognized planets are M ...
Astronomy 360 - Indiana State University
Astronomy 360 - Indiana State University

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XI. Astronomy: Solar-System Debris and Comets

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Ch. 27

... an astronomer who proposed a geocentric model of the solar system that stated that the sun and other planets in our solar system revolve around Earth. ...
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... 35. While looking through a telescope, you see a galaxy with lots of main sequence stars in the outer regions and lots of white dwarfs and red giants near the center. What kind of galaxy do you think it is and why? Explain. ...
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4550-15Lecture35

... inherited from the larger nebula will cause the system to spin at an increasing rate as it contracts. For a cloud to collapse and create an isolated star, it must rid itself of over 99% of its angular momentum in the process of collapse. Otherwise the resulting centrifugal force will break up the st ...
the universe
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... satellites - moons - in orbit around most of the planets, comets and asteroids in orbit around the Sun. There are eight planets, including the Earth, and smaller dwarf planets, such as Pluto, Ceres and Eris. The Sun's gravity keeps the planets, dwarf planets, comets and asteroids in orbit. The gravi ...
94263_Solar_Sys_Halfs
94263_Solar_Sys_Halfs

... one end (skinny along the edge) and “Kuiper Belt” on the other end. (The “Kuiper Belt” is between Neptune and the Oort Cloud. Pluto is considered a Kuiper Belt object.) 1. Estimate: On one side of your strip, write the names of all the planets where you think they are within the solar system. 2. On ...
Assessment - hrsbstaff.ednet.ns.ca
Assessment - hrsbstaff.ednet.ns.ca

... are 8.00 m apart. What is the gravitational force between the spheres? 15. What will be the force if the spheres described in question 14 are positioned with ...
Sorting the Solar System
Sorting the Solar System

... This is great! You are being real scientists. This is exactly what biologists, chemists, geologists, and astronomers do. And as new bacteria or birds or fossils are found, they use their knowledge of what has already been discovered to help them think about this new object. That's exactly what happe ...
the universe
the universe

... satellites - moons - in orbit around most of the planets, comets and asteroids in orbit around the Sun. There are eight planets, including the Earth, and smaller dwarf planets, such as Pluto, Ceres and Eris. The Sun's gravity keeps the planets, dwarf planets, comets and asteroids in orbit. The gravi ...
Universe and Solar System
Universe and Solar System

... Role: You are a member of your 6th grade class, which is helping your school compete for a hosting the President for a nationally televised address on space. Audience: The selection team for the President’s visit to a middle school, including educators and NASA scientists. Situation: The first space ...
answers2004_05_BC - Particle Physics and Particle Astrophysics
answers2004_05_BC - Particle Physics and Particle Astrophysics

... extrasolar planets differ from the properties of the planets in the solar system.  most discovered planets are gas-giant-sized, but in orbits typical of our terrestrial planets (< 3AU)  some planets are in orbits which are very small indeed (<<1 AU), where our solar system has no planets at all  ...
Asteroids, Comets, Meteors…what`s the difference
Asteroids, Comets, Meteors…what`s the difference

... Asteroids, Comets, Meteors…what’s the difference? Astronomy Name: ...
Assessment - hrsbstaff.ednet.ns.ca
Assessment - hrsbstaff.ednet.ns.ca

... are 8.00 m apart. What is the gravitational force between the spheres? 15. What will be the force if the spheres described in question 14 are positioned with ...
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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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