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Distances intheSolar System
Distances intheSolar System

... Copy the table onto the board and explain that the distances have been scaled down to make them workable. If necessary, explain the concept of workable figures. The children enter the workable figure for their planet in Task 3 of the worksheet. Take the children outside. Use chalk to mark a spot in ...
The ancient Greeks were first to propose
The ancient Greeks were first to propose

... the heliocentric model must be correct. The Earth is now placed as the third planet moving around the Sun. The new heliocentric model was no more accurate than the system of Ptolemy, in part because Copernicus still had circular orbits. Tycho Brahe was a late 16th century Danish nobleman who carrie ...
Origin of the Solar System
Origin of the Solar System

The Solar System
The Solar System

... Million of these hit Earth's atmosphere every day When these particles enter the atmosphere, they heat up quickly, burning and producing brief flashes of light that we see as shooting stars or meteors Occasionally some of the larger chunks survive the passage through the atmosphere and land on Earth ...
Solar System Origin II
Solar System Origin II

... • If the protoplanet grew big enough (5-10 Earth masses) very early when there was still lots of nebular gas: - accretes a lot of gas, has a solar-like composition. - Jupiter and Saturn! • If the protoplanet grew big enough (5-10 Earth masses) but not until later, when there was less nebular gas: - ...
Unit 5: Space Exploration Topic 1: Our Eyes Only • Define FRAME
Unit 5: Space Exploration Topic 1: Our Eyes Only • Define FRAME

... • Define ZENITH: the point directly above (90 degrees) • Define EARTH CENTERED MODEL/GEOCENTRIC. Who originally came up with this idea? Who refined it? Based on the ideas of Greek philosopher Aristotle states that the Earth is the center of the universe. It has an outer celestial sphere with many in ...
STANDARD SET 4. Earth Sciences
STANDARD SET 4. Earth Sciences

... NOTE: Since the writing of the “Frameworks,” Pluto has been reclassified as a “dwarf planet” along with several other known small bodies of similar size. There are likely to be hundreds more discovered out beyond Pluto, and it seemed silly to keep expanding the number of “planets” in the solar syste ...
Lectures 10-11: Planetary interiors o   Topics to be covered:
Lectures 10-11: Planetary interiors o   Topics to be covered:

... o  Moon: highland heavily cratered, lava flows in maria. o  Medium terrestrial planets: Interior cooled off recently. o  Moderate cratering. o  Few extinct volcanoes. o  E.g., Mars. ...
Wazzat Mean - Peterborough Astronomical Association
Wazzat Mean - Peterborough Astronomical Association

... Any prominent star pattern that isn’t a whole constellation, such as the Northern Cross or the Big Dipper. Asteroid (Minor Planet) A solid body orbiting the Sun that consists of metal and rock. Most are only a few miles in diameter and are found between the orbits of Mars and Jupiter, too small and ...
Origin of Terrestrial Planets and-the Earth
Origin of Terrestrial Planets and-the Earth

... formed using such direct integration techniques by John Chambers of NASlt's Ames Research Center.? The simulated systems display a wide variety of architectures but are generally similar to our solar system'sterrestrial planets in terms of the number of frnal planets and their masses.Anotable differ ...
The Solar System
The Solar System

... system is the Sun. The nine planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto then orbit the Sun. When a planet orbits the sun it basically means that the planet goes around the sun. An orbit is also called an ellipse. The ellipse or orbit of a planet is also not a per ...
AstronomyQuotes
AstronomyQuotes

... center of the universe. This one misconception led people to entertain complex and ultimately untrue laws of nature, for example, that the planets traveled around earth in complex retrograde cycles. In 1542, Copernicus published “Concerning the Revolutions of the Heavenly Spears,” which replaced pri ...
Light: The Cosmic Messenger
Light: The Cosmic Messenger

... 1) The Earth’s Moon has more angular momentum than most other planet moon systems. 2) The Earth’s Moon does not have a large iron-nickel core even though it is almost as big as Mercury. 3) The Earth’s Moon is depleted in volatiles, things that evaporate easily. What ever made it must have been heate ...
Chapter 13 32)Which method could detect a planet in an orbit that is
Chapter 13 32)Which method could detect a planet in an orbit that is

... c) Astrometric method. The astrometric method measures the tangential motion of a star, and a face-on planetary orbit would force the star to move in the tangential direction. In contrast, both the Doppler and transit method require that the planet orbit partially edge on measure a radial velocity o ...
Planets
Planets

... planets (or plutoids), an asteroid belt, comets, meteors, and others. The sun is the centre of our solar system; the planets, their moons, a belt of asteroids, comets, and other rocks and gas orbit the sun. The eight planets that orbit the sun are (in order from the sun): Mercury, Venus, Earth, Mars ...
Our Solar System 6.1 Planets 6.2 Dwarf planets and other solar
Our Solar System 6.1 Planets 6.2 Dwarf planets and other solar

... rocky, while the Jovian ones are gassy giants. In the inner part of the solar system, heat from the sun made it too hot for most of the gas in the disk to condense into a solid. Only small amounts of highdensity materials like rock and metals could condense, resulting in small, rocky planets. Farthe ...
Opposition of Saturn - Hong Kong Observatory
Opposition of Saturn - Hong Kong Observatory

... Saturn revolves around the Sun with a period of about 29.5 years. Opposition of Saturn will occur about once every 378 days. The last Saturn opposition occurred on  18 December 2002 and the next occurrence will be on 1 January 2004.  As Saturn has just passed the perihelion of its orbit in July 2003 ...
Chapter 1 - A Modern View of the Universe
Chapter 1 - A Modern View of the Universe

... A relatively small and primarily icy object which orbits a star. ...
Sample pages 1 PDF
Sample pages 1 PDF

...  The Egyptians, like the Babylonians, kept to a lunar cycle but eventually changed to a 12-month, 30-day system. However, in order to make the new year coincide with the appearance of Sirius, they added extra days to the calendar, giving us the 365-day year. ...
Habitats Jr. 04
Habitats Jr. 04

... Do you ever wonder how the Earth is different from the Moon? For starters there is no liquid water on the Moon, only ice. Another difference between the Earth and the Moon is that there is a lower amount of gravity on the Moon. Also, the wide range of temperatures on the Moon are so extreme that you ...
slides
slides

... 1 km/s ...
GY 112 Lecture Notes - University of South Alabama
GY 112 Lecture Notes - University of South Alabama

... material to explain the gravity that we knew was there. The solution? Invent invisible matter. Thus was born “dark matter”. You got to love physics. If reality doesn’t fit your ideas, change reality. The rest of us poor scientists actually have to prove our ideas. Now don’t get me wrong. I actually ...
Small Bodies of the Solar System Transcript
Small Bodies of the Solar System Transcript

... years ago. Most of the material in the original cloud will have fallen to the centre, collapsing under its own gravity, where the gravitational energy released will have heated up the core until it reached sufficient temperature for nuclear fusion to be ignited. At the point that the proto-star star ...
Unit 6 – Earth
Unit 6 – Earth

... just the right distance away to give us conditions that are suitable for life. All the other planets in the solar system are too hot or too cold. Astronomers believe that there are many stars that have solar systems, if not the majority. They cannot see the planets; they are too far away, but they c ...
PPT - McMaster Physics and Astronomy
PPT - McMaster Physics and Astronomy

... AU) can have high water content No more than 10% of Earth’s water from comets Perturbations by Jupiter of asteroid system perturbs their orbits into ellipses that cross Earth’s orbit and collide,… bringing in water. Do amino acids survive during this bombardment? Evidence for bombardment: craters on ...
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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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