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Astronomy Vocabulary File
Astronomy Vocabulary File

... Terrestrial planets—the small, dense, rocky planets of the inner solar system Prograde rotation—the counter-clockwise spin of a planet or moon as seen from above the planet’s North Pole Retrograde rotation—the clockwise spin of a planet or moon as seen from above the planet’s North Pole Gas giants—t ...
Earth-sized planet found just outside solar system
Earth-sized planet found just outside solar system

... Alpha Centauri B is very similar to the Sun but slightly smaller and less bright. The newly discovered planet, with a mass of a little more than that of the Earth, is orbiting about six million kilometres away from the star, much closer than Mercury is to the Sun in the Solar System. The orbit of th ...
The Solar System
The Solar System

... Scientists discovered other large objects in the Kuiper (rhymes with hyper) belt beyond Neptune’s orbit. Some scientists wanted to consider these objects planets as well. Other scientists argued that Pluto and these newly discovered objects were different from the other eight planets. In 2006, the I ...
Kuiper Mission Team Presentation
Kuiper Mission Team Presentation

... What is the KBO Discovery Mission? • What has preceded it? New Horizons! • Planetary Telescope • Connections between weather and climate in giant planet atmospheres, satellites, and their external environments • Flexible launch dates; primary mission completed by mid-2024 ...
Kepler`s First Law
Kepler`s First Law

... Kepler’s THIRD LAW The size of the orbit determines the orbital period planets that orbit near the Sun orbit with shorter periods than planets that are far from the Sun MASS DOES NOT MATTER Both have p = 1 year ...
Astronomy Library wk5.cwk (WP)
Astronomy Library wk5.cwk (WP)

... If a proto-planet grows large enough, its gravity will become strong enough to pull gas from the nebula (mostly hydrogen and helium) onto itself. ...
ppt
ppt

... Neptune was discovered in 1846. Is it easy to see and identify Uranus and Neptune as planets? Why or why not? How are they identified as planets? ...
157a_midterm_2016
157a_midterm_2016

Part 2 of Test- Planet Flip Book
Part 2 of Test- Planet Flip Book

solar system formation notes
solar system formation notes

...  The gas that wasn’t taken in by planets was pushed out of the solar system by solar wind  Planetesimals hitting planets could knock planets onto their sides ...
Neptune`s - P7
Neptune`s - P7

...  Our solar system :The sun is at the centre of our solar system. It is a massive ball of gasses which produces as 100’000m hydrogen bombs exploding...every second! The nine planets of the solar system and more than 60 moons orbit the sun. ...
Name____________________________________________
Name____________________________________________

... 2. From largest to smallest, order the following (1 is largest -4 is smallest): __4___ The Sun __3__ Our Solar System __2___ The Milky Way __1__ The Universe 3. What is a galaxy? A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity. 4. What does an ellip ...
Models of The Solar System
Models of The Solar System

... The law of ellipses states that each planet orbits the sun in a path called an ellipse, not in a circle. An ellipse is a closed curve whose shape is determined by two points, or foci, within the ellipse. In planetary orbits, one focus is located within the sun. Elliptical orbits vary in shape. Its e ...
Slide 1 - NMSU Astronomy
Slide 1 - NMSU Astronomy

... 60 moons counted so far ...
Lecture3
Lecture3

Powerpoint - Sandhills Astronomical Society
Powerpoint - Sandhills Astronomical Society

... Has sufficient mass for its self-gravity to overcome rigid-body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, Has not cleared the neighborhood around its orbit, and Is not a satellite. ...
solar system form
solar system form

... Spectacular rings Many moons, including cloudy Titan ...
Origins of the Universe
Origins of the Universe

... • Stars of a constellation are often far apart from each other, but they appear grouped together when viewed from Earth • One of the 88 sectors into which astronomers divide the sphere of the skynamed after a traditional constellation in that sector • Patterns of constellations are dynamic; therefor ...
Solar System Model
Solar System Model

... Your instructor will assign a planet (or the Sun) to your group. Make a drawing of your planet (or the Sun) on a sheet of paper using the scale of Table #1 in centimeters. Tape your drawing of the planet outside the classroom along the walkway at the scaled distance calculated in Table #2 in meters ...
Overview of Solar System - FLASH Center for Computational Science
Overview of Solar System - FLASH Center for Computational Science

... though Saturn’s is by far the most spectacular.  These rings are the remnant material left over from the formation of the moons surrounding the planet, and are made up of enormous numbers of icy rocks.  In a sense, the moon/planet systems are a kind of “mini solar system,” and the rings are analog ...
ch16 b - Manasquan Public Schools
ch16 b - Manasquan Public Schools

...  This radiation was predicted by the theory.  The radiation has shown a cooling trend which has allowed scientist to measure the overall temperature of the universe. (2.7 K)  Also the amount hydrogen (most common ...
Grade 3 Social Studies
Grade 3 Social Studies

... If you want to remember the eight planets in order, you can say, “My Very Educated Mother Just Served Us Noodles.” Do you see how the first letter of each word is the first letter of each of the planets? Our solar system is one small part of the galaxy called the Milky Way. Let us see how the Earth, ...
Greek and Hellenistic Astronomy
Greek and Hellenistic Astronomy

... Andreas Cellarius, Harmonia Macrocosmica (Amsterdam, 1660) ...
Lecture 4, PPT version
Lecture 4, PPT version

... upon it and noticing that same star placed close to the stars which antiquity attributed to Cassiopeia. When I had satisfied myself that no star of that kind had ever shone forth before, I was led into such perplexity by the unbelievability of the thing that I began to doubt the faith of my own eyes ...
Learning Tracker for Space Unit with ANSWERS
Learning Tracker for Space Unit with ANSWERS

... create explanations and diagrams that communicate the relative size and distances between objects in space. Given options, identify scales, proportions, and quantities that match or help explain those of objects in space. ESS1.A The Universe and its Stars What could be described as “made up of” gala ...
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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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