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The Sky from Earth
The Sky from Earth

... • A body that orbits that is not man made ...
space I have Who has
space I have Who has

... Who has the level of the universe that contains the sun, eight major planets, and various smaller bodies? ...
Why SETI will Fail
Why SETI will Fail

... technological extraterrestrial. Earth, thanks to life, has had an oxygenic atmosphere for about 2 billion years. Any extraterrestrials who possess the equivalent of our TPF and who passed near our Sun during those years, would have discovered ...
The Lives of Stars
The Lives of Stars

... Didn’t have enough gravity to hold on to their hot atmospheres Became rocky inner planet (M,V,E,Ma) ...
GSC 1580 Vocabulary/Who`s Who
GSC 1580 Vocabulary/Who`s Who

... proposed the heliocentric system, that the stars are stationary, and that heavenly bodies move in perfect circles and at constant speeds. Coriolis force: an apparent force that as a result of the Earth's rotation deflects moving objects (as projectiles or air currents) to the right in the northern h ...
Powerpoint file
Powerpoint file

... If we leave out fi and fc (i.e. assume they are unity—all life forms develop our kind of intelligence and technology and try to communicate), we are calculating the number of life-bearing planets in our Galaxy at any given time (like now). We know there has been life on our planet for 3 billion year ...
The Solar System Purpose
The Solar System Purpose

... Our goal is to create an approximately scale model of the solar system on the Houghton College campus. To do this, we first need to determine the scaling factor. Examine the photograph of Houghton College in Figure 1. We need to put a scale on the photograph in order to know where each planet should ...
Astronomical Units and Light Years #2
Astronomical Units and Light Years #2

... the Earth and the Sun. In terms of more common units of measurement, an astronomical unit is equal to about 93 million miles (roughly 150 million km), or the distance light travels in a little over eight minutes. The symbol AU is most often used to represent the astronomical unit, though less common ...
Pluto and the Kuiper Belt
Pluto and the Kuiper Belt

... Jupiter and Saturn are failed stars. They have the same composition as the Sun but are not massive enough for the nuclear reactions that power stars. However, they shone like faint stars for a few hundred million years while they were forming, radiating away the excess energy from their gravitationa ...
Exoplanet Working Group
Exoplanet Working Group

... – Commonly form around stars (single or binaries) – Have masses in a wide range (0.6 < m < 10 mJup ) – Can be found in the inner part of the system – Can have orbits with very large eccentricities ...
The Milky Way
The Milky Way

... Models were generally wrong because they were based on wrong “first principles”, believed to be “obvious” and not questioned: 1. Geocentric Universe: Earth at the Center of the Universe 2. “Perfect Heavens”: Motions of all celestial bodies described by motions involving objects of “perfect” shape, i ...
Solar System topics
Solar System topics

... Pluto was discovered in 1930 by the American astronomer Clyde Tombaugh. It was the culmination of a many-year search at Lowell Observatory in Flagstaff, Arizona. It was regarded as an official planet until 2006. Now it is considered a dwarf planet. To be regarded as a planet an object must: 1) orbi ...
Geocentric System
Geocentric System

... The Moon is Falling! Newton’s insight: same force causes apple to fall and keeps Moon in orbit; decreases as square of distance, as does ...
Lecture 1 The Big Picture: Origin of the Earth
Lecture 1 The Big Picture: Origin of the Earth

...  The planets can be divided into two groups  The inner terrestrial (Earth-like) planets (Mercury, Venus, Earth, Mars): small, dense  The outer Jovian (Jupiter-like) planets (Jupiter, Saturn, Uranus, and Neptune): gaseous, giant, low density  Pluto is an exception; it is an "icy planet".  A pla ...
Planets - Cardinal Hayes High School
Planets - Cardinal Hayes High School

... • Planets – bodies that are partly solid or gaseous that orbit around the sun and are seen by reflected sunlight • Satellite – solid bodies that orbits planets (moons) ...
The Milky Way
The Milky Way

... Models were generally wrong because they were based on wrong “first principles”, believed to be “obvious” and not questioned: 1. Geocentric Universe: Earth at the Center of the Universe 2. “Perfect Heavens”: Motions of all celestial bodies described by motions involving objects of “perfect” shape, i ...
Solar System Review
Solar System Review

... Solar System Review ...
S E N S ` 2 0 0 6
S E N S ` 2 0 0 6

... basic questions arising when somebody think about the origin of Solar system and other planetary systems. But there is not yet any theory confirmed all circumstances. How one planet begins its life? Is it originate from the gas and dust between stars? Or it’s life begins from star’s pieces after som ...
True or False: If the statement is true, write “True”, if it is “False” tell
True or False: If the statement is true, write “True”, if it is “False” tell

... _____ The Earth’s seasons are caused by its closeness to or distance from the sun. _____________________________________________________________________________________ _____ Earth is the only planet with two moons. ____________________________________________________________________________________ ...
Planetary Systems Unit Part 3: The Solar System
Planetary Systems Unit Part 3: The Solar System

... 100 pounds (your Earth weight) multiplied by 0.17 (the gravity factor for the moon) = 17 pounds. Remember, your mass does not change at different locations. Your mass remains the same; it is your weight that changes due to the force of gravity on the different planets. ...
Friends of the Planetarium Newsletter September
Friends of the Planetarium Newsletter September

... reaches of the solar system." Several senior members of the New Horizons science team were young members of Voyager's science team in 1989. Many remember how Voyager 2's approach images of Neptune and its planetsized moon Triton fueled anticipation of the discoveries to come. They share a similar, g ...
Neptune
Neptune

... “Neptune: The Other Blue Planet in our Solar System” Space.com http://www.space.com/41neptune-the-other-blue-planet-in-our-solarsystem.html/ “Neptune” All About Astronomy ...
Astronomy Review (Cope) 64KB Jun 09 2013 08:13:01 PM
Astronomy Review (Cope) 64KB Jun 09 2013 08:13:01 PM

... 18. Starting with the speed of light being 3.00 x 10 meters per second (or 300,000 km per second), calculate how far light will travel in one (365 day) year. Stars ...
Take a Grand Tour of the solar system at twice the speed of light
Take a Grand Tour of the solar system at twice the speed of light

... Washington St., we enter the transition zone from small, dense planets to the gas giants. The asteroid belt begins soon after we leave Mars. Just past Mills St. is the dwarf planet Ceres at a distance nearly double Mars’s from the Sun. Ceres is the largest of the millions of asteroids, most very sma ...
Document
Document

... • A year on HD209458b is only 3.5 Earth-days long. The planet orbits so close to its star that its atmosphere is being blown away by gales of stellar wind. Scientists estimate the planet is losing at least 10,000 tons of material every second. Eventually, only a dead core of the shrinking planet wil ...
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IAU definition of planet



The definition of planet set in Prague in 2006 by the International Astronomical Union (IAU) states that, in the Solar System, a planet is a celestial body which: is in orbit around the Sun, has sufficient mass to assume hydrostatic equilibrium (a nearly round shape), and has ""cleared the neighborhood"" around its orbit.A non-satellite body fulfilling only the first two of these criteria is classified as a ""dwarf planet"". According to the IAU, ""planets and dwarf planets are two distinct classes of objects"". A non-satellite body fulfilling only the first criterion is termed a ""small Solar System body"" (SSSB). Initial drafts planned to include dwarf planets as a subcategory of planets, but because this could potentially have led to the addition of several dozens of planets into the Solar System, this draft was eventually dropped. The definition was a controversial one and has drawn both support and criticism from different astronomers, but has remained in use.According to this definition, there are eight planets in the Solar System. The definition distinguishes planets from smaller bodies and is not useful outside the Solar System, where smaller bodies cannot be found yet. Extrasolar planets, or exoplanets, are covered separately under a complementary 2003 draft guideline for the definition of planets, which distinguishes them from dwarf stars, which are larger.
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