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Habitats Jr. 04
Habitats Jr. 04

... burning gas. The Sun is about 4.6 billion years old. It is the center of our solar system. As Earth turns, the Sun appears to move across the sky. This is not because the Sun is moving. Earth is rotating, making it look as if the Sun moves from east to west in our sky. ...
Discovery of the Kuiper Belt
Discovery of the Kuiper Belt

... asteroids and comets. But beyond Jupiter lay only the planets and the strange interplanetary body Chiron (discovered by Charles Kowal in 1977). Very slowly, I realized that there could be two reasonable explanations for the emptiness of the outer solar system. First, the outer regions could be empty ...
Problem Set #1
Problem Set #1

... Finding the A.U. (and the scale of the solar system). The classical greeks estimated the relative distances of the Moon and the Sun, but not absolute values. Although we now know the A.U. (the mean radius of the Earth’s orbit) to within about a meter, historically it was very hard to determine. You ...
Kepler - STScI
Kepler - STScI

... •Giant planets, as a class, are enriched in heavy elements •Enriched compared to the Sun •Enriched compared to their parent stars •Enrichment is a strong inverse function of mass, but with an apparent “floor” at high mass •The heavy element mass of an inflated planet could be estimated only from its ...
Star Of Wonder
Star Of Wonder

... supernova, the dramatic brightening of a star caused by an explosion of the entire star. Supernovas occur when a giant star, much more massive than our sun, runs out of nuclear fuel and, in just one second, "collapses" inward to become a far smaller object, ripping the entire star apart and throwing ...
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... • Depends on its position relative to Sun, i.e. its phase • New Moon: same as Sun • Full Moon: opposite of Sun ...
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Study Guide for 1ST Astronomy Exam

... The successful will be able to… Unit 1: Our Planetary Neighborhood  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 diameter ...
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Study Guide for 1ST Astronomy Exam

... The successful will be able to… Unit 1: Our Planetary Neighborhood  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 diameter ...
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Life Cycle of Star EDpuzzle worksheet

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... 43. core—innermost section, where most of the thermonuclear reactions that generate the sun’s energy take place. 44. The fusion energy travels through the radiative zone as electromagnetic waves. 45. In the suns convective zone, hot plasma rises to the surface, cools and descends into the interior a ...
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Name - MIT

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Name - MIT

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... which are contained inside others. In other words, this chapter will give us perspective for all of our exploration to follow. It is easy to learn a few facts, but it is the relationships between facts that are interesting. The relationships illustrated in this chapter will give us a perspective on ...
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Year 8 Science Home Learning Booklet

... (b) The diagram below shows the position of the Earth and the Sun when the astronomer made her observations. She noticed that Regulus was directly overhead at midnight. On the diagram, draw an arrow from the Earth to show the direction in which she looked to see ...
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... which are contained inside others. In other words, this chapter will give us perspective for all of our exploration to follow. It is easy to learn a few facts, but it is the relationships between facts that are interesting. The relationships illustrated in this chapter will give us a perspective on ...
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... Circumference:159,354km (99,018 miles), nearly four times the size of Earth. Mass:About the same as 14.5 Earths. Volume:63 Earths could fit inside Uranus. Density:0.23 times Earth’s. Temperature:About -220°C at the top of its clouds. Rotation:Uranus takes 17 hours to complete 1 rotation on its axis. ...
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...  Because Earth’s axis is tilted, some parts of Earth tilt toward the Sun during a revolution. The other parts tilt away from the Sun.  This tilt causes the seasons.  It is summer when part of Earth tilts towards the Sun. It is winter when part of Earth tilts away from the Sun. ...
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Module_5-4 - St Paul Composite Squadron
Module_5-4 - St Paul Composite Squadron

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The Lives of Stars

... 200 billion years • medium-mass stars like the sun live for about 10 billion years • astronomers think the sun is about 4.6 billion years old, so it is almost halfway through its lifetime ...
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keplers laws and newton - Fort Thomas Independent Schools

... Earth has less mass, less inertia, same gravitational force; thus, more easily accelerated ...
Instructional Design 1
Instructional Design 1

... The fifth grade curriculum explores many facets of Earth and Space Science. The Ohio State Standards emphasizes an understanding or our Solar System and its many parts. The use of videos, Interactive White Board activities and websites to teach 5th grade space concepts are an excellent means to stud ...
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Formation and evolution of the Solar System



The formation of the Solar System began 4.6 billion years ago with the gravitational collapse of a small part of a giant molecular cloud. Most of the collapsing mass collected in the center, forming the Sun, while the rest flattened into a protoplanetary disk out of which the planets, moons, asteroids, and other small Solar System bodies formed.This widely accepted model, known as the nebular hypothesis, was first developed in the 18th century by Emanuel Swedenborg, Immanuel Kant, and Pierre-Simon Laplace. Its subsequent development has interwoven a variety of scientific disciplines including astronomy, physics, geology, and planetary science. Since the dawn of the space age in the 1950s and the discovery of extrasolar planets in the 1990s, the model has been both challenged and refined to account for new observations.The Solar System has evolved considerably since its initial formation. Many moons have formed from circling discs of gas and dust around their parent planets, while other moons are thought to have formed independently and later been captured by their planets. Still others, such as the Moon, may be the result of giant collisions. Collisions between bodies have occurred continually up to the present day and have been central to the evolution of the Solar System. The positions of the planets often shifted due to gravitational interactions. This planetary migration is now thought to have been responsible for much of the Solar System's early evolution.In roughly 5 billion years, the Sun will cool and expand outward many times its current diameter (becoming a red giant), before casting off its outer layers as a planetary nebula and leaving behind a stellar remnant known as a white dwarf. In the far distant future, the gravity of passing stars will gradually reduce the Sun's retinue of planets. Some planets will be destroyed, others ejected into interstellar space. Ultimately, over the course of tens of billions of years, it is likely that the Sun will be left with none of the original bodies in orbit around it.
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