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Beyond the earth - steadyserverpages.com
Beyond the earth - steadyserverpages.com

... – Small amounts of cold material condense to form icy objects – It is believed that a large belt of these objects exist, but they are difficult to observe. ...
Universe Now - Course Pages of Physics Department
Universe Now - Course Pages of Physics Department

... • 4 Jovian planets: Jupiter, Saturn, Uranus, Neptune • 5 dwarf planets: Pluto, Ceres, ...
Four Unexplained Features of our Solar System
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... Collisions or close encounters with leftover planetesimals can explain the exceptions. ...
Sun, Moon, and Planets Study Guide
Sun, Moon, and Planets Study Guide

... Students will be asked to match words to definitions, fill in the blanks, write the names of the phases of the moon, explain (short answer) WHY WE SEE THE MOON and THE DIFFERENCE BETWEEN ROTATION AND REVOLUTION. Vocabulary Learned: Solar system: a system that includes our sun, the planets and their ...
Is Pluto a planet or a Kuiper Belt comet?
Is Pluto a planet or a Kuiper Belt comet?

... planetesimals, preventing them from accreting into a planet. Those that were not ejected from this region make up the • How are meteorites related to asteroid belt today. Most asteroids? asteroids in other regions of the inner solar system accreted into • Most meteorites are pieces of asteroids. Pri ...
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27.2 Models of the Solar System (p 691

Astronomy Review Sheet
Astronomy Review Sheet

... 13. How did technology and/or new methods help to change the model of the solar system? Telescopes made the discovery of Jupiter’s moons possible; new methods like using math and the scientific method helped prove the heliocentric model was correct. ...
Our Planetary Neighborhood
Our Planetary Neighborhood

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... S4E2: Students will model the position and motion of the earth in the solar system and will explain the role of relative position and motion in determining sequence of the phases of the ...
Conjunctions an Oppositions
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... Superior Planets orbit farther from the Sun than Earth. They can be in conjunction or opposition. They are in Conjunction when they are on the other side of the Sun. As far away as they can be from Earth. They are in Opposition when the Earth is between the Superior Planet and the Sun. It is then th ...
Conjunctions an Oppositions
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... Superior Planets orbit farther from the Sun than Earth. They can be in conjunction or opposition. They are in Conjunction when they are on the other side of the Sun. As far away as they can be from Earth. They are in Opposition when the Earth is between the Superior Planet and the Sun. It is then th ...
How Much Do You Weigh
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... far away from Earth’s gravitational pull, you would be weightless and would float. Mass is the amount of matter that makes up an object. The gravitational pull depends upon mass. Even a pencil has mass. Thus, it has gravitational pull, but since it is far less than the earth’s mass, it falls to the ...
Topic E: Astrophysics
Topic E: Astrophysics

... a) is in orbit around the Sun b) has sufficient mass for its self-gravity to overcome rigid body forces so that is assumes a hydrostatic equilibrium (nearly round) shape c) has cleared the neighborhood around its orbit. ...
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... ringer. Copy down the entire question and all of the options. Then circle the answer that you choose. In which of the following locations are asteroids not likely to be located? A. Kuiper belt B. Oort cloud C. in the orbits of Jupiter and Neptune D. crossing Earth’s orbit ...
Page 577 - ClassZone
Page 577 - ClassZone

... Earth stood still at the center of the universe. Such a model of the universe is called a geocentric (JEE-oh-SEN-trihk), or Earth-centered, model. As long as 6000 years ago, astronomers were recording the movements of the stars. They noted that the stars appeared to move across the sky, but they did ...
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... What is a planet? • In August of 2007 the International Astronomical Union redefined what a planet is (no official scientific definition of a "planet" existed before). A planet: 1. Is a body that orbits the sun (this definition only applies to our Solar System) 2. Is large enough for its own gravity ...
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20 Planetology07aaa0

... 6. <10% of the mass accretes into larger and larger particles which eventually form planetesimals (60 – 100). As the planetesimals collided, they grew in size and mass (gravitational attraction), but fewer in number, to form the planets.  Large collisions among planetesimals resulted in: a) b) ...
Lesson #2: Planets - Center for Learning in Action
Lesson #2: Planets - Center for Learning in Action

... their diagrams they began to build last lesson Student will be able to: Learn about the nine planets and their order. Accurately place the planets in line on their clay diagrams. Background Information for Teacher: Our solar system consists of the sun, eight planets, moons, dwarf planets (or plutoid ...
Notes with questions
Notes with questions

... Earth, one of the planets that orbit the Sun, formed 4.5 billion years ago from a great cloud of dust. ...
Fundamental Concepts and Skills
Fundamental Concepts and Skills

... Fundamental Concepts and Skills Gravity in the Solar System -Gravity is a force that keeps the planets in motion around the sun. -Gravity acts everywhere in the universe. -The larger and closer the objects the more gravitational pull. -What is the difference between mass and weight?  On a planet wi ...
Planet Highlights Lesson
Planet Highlights Lesson

... Moons of Mars • 2 Moons –Phobos ...
< 1 ... 324 325 326 327 328 329 330 331 332 ... 385 >

Late Heavy Bombardment



The Late Heavy Bombardment (abbreviated LHB and also known as the lunar cataclysm) is a hypothetical event thought to have occurred approximately 4.1 to 3.8 billion years (Ga) ago, corresponding to the Neohadean and Eoarchean eras on Earth. During this interval, a disproportionately large number of asteroids apparently collided with the early terrestrial planets in the inner Solar System, including Mercury, Venus, Earth, and Mars. The LHB happened after the Earth and other rocky planets had formed and accreted most of their mass, but still quite early in Earth's history.Evidence for the LHB derives from lunar samples brought back by the Apollo astronauts. Isotopic dating of Moon rocks implies that most impact melts occurred in a rather narrow interval of time. Several hypotheses are now offered to explain the apparent spike in the flux of impactors (i.e. asteroids and comets) in the inner Solar System, but no consensus yet exists. The Nice model is popular among planetary scientists; it postulates that the gas giant planets underwent orbital migration and scattered objects in the asteroid and/or Kuiper belts into eccentric orbits, and thereby into the path of the terrestrial planets. Other researchers argue that the lunar sample data do not require a cataclysmic cratering event near 3.9 Ga, and that the apparent clustering of impact melt ages near this time is an artifact of sampling materials retrieved from a single large impact basin. They also note that the rate of impact cratering could be significantly different between the outer and inner zones of the Solar System.
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