Solar System
Humans live on a small planet in a tiny part of a vast universe. This part of the universe is called the solar system, and is dominated by a single brilliant star-the sun. The solar system is the earth’s neighbourhood and the planets Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto are the Earth’s neighbours. They all have the same stars in the sky and orbit the same sun.
Scientists believe the solar system began about 5 billion years ago, perhaps when a nearby star exploded and caused a large cloud of dust and gas to collapse in on itself. The hot, central part of the cloud became the sun, while some smaller pieces formed around it and became the planets. Other fragments became asteroids and comets, which also orbit the sun. The early solar system was a turbulent mix of hot gas and rocky debris.
In the solar system everything is affected by the sun’s gravity. The planets and a variety of other objects, including comets, move the way they do because of the sun’s gravitational attraction. Our planet, Earth, is the third out from the sun. The planets are all different. Their differences are largely the result of their different distances from the sun.
We call the planets that are closer to the sun, including the Earth, the inner planets. They are small rocky worlds. The outer planets are much larger and are made from much lighter materials. All but two planets, Mercury and Venus, have moons in orbit around them.
The Moon
The explorers found a dead world. There is no air and no water. Without an atmosphere, the sky is black at midday and the temperatures swing by hundreds of degrees from day to night. No rivers or oceans have eroded the surface; no volcanoes are rebuilding the boring landscape.
The surface has survived unchanged for billions of years. Smooth plains and lava flows that froze on the Moon long before life arose on the Earth. Elsewhere, the Moon still bears the scars of every rock that has hit it from space, both large and small. The footprints of the visiting astronauts will survive for millions of years.
Crash and splash
Astronomers now believe the Moon is the remains of a giant cosmic traffic accident. In its very early days, the Earth was hit by a runaway planet the size of Mars. White-hot molten rock were splashed into space, and solidified into a ring of rocks around the Earth. These th...
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...ut beyond Neptune. Then the surprises began to appear.
First, Pluto follows a very elongated path rather than a neat circle around the Sun. Its orbit crosses over Neptune’s more circular route, so that sometimes Pluto is actually closer to the Sun than Neptune is. Its orbit it also tilted up more than any other planet.
Double planet
With better telescopes, astronomers found that Pluto is far smaller than any other planet-only half the size of Mercury is. And it’s not alone. In 1978, a moon was discovered orbiting very close to Pluto itself: only a powerful telescope can show them apart. This moon, Charon, is half Pluto’s own size, so that the two look more like a double planet and its moon.
Charon lies so close to Pluto that it looms large in the sky. Pluto and Charon always turn the same face to each other as they orbit: from one side of Pluto Charon is always visible, while an imaginary inhabitant on the other side would never see Charon at all.
In the 1990s, astronomers started finding many smaller worlds orbiting the Sun in this region, rather like the asteroid belt further in. Because they are made mainly of frozen water and gases, they are called “ice dwarfs”.
There are many theories that all the planets and other space rocks in the solar system orbit around the sun and follow the orbiting route due to the sun’s gravitational force keeping them in course. According to Sir Isaac Newton’s first law “An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.” This law is often called "the law of inertia". This is why these planets don’t go severely of course due to the consistent gravitational field the sun is providing. The Kuiper belt and the Asteroid belt are where most of the space rocks, also known as asteroids; orbit along and many stay together because they are part of the s...
...order to increase revenues to $20 million before the end of 2001, Natureview should choose option three and introduce two SKUs of a children’s multi-pack into the natural foods channel. This option carries the least amount of financial risk and would allow the company to build off of its already well-established position within the natural foods channel. Since women already represent 70% of yogurt purchases, the company should market the children’s multi-packs to mothers as a fast, easy, delicious and nutritious option for children as an addition to a meal or as a snack.
Throughout history, the United States has initiated policies, peace agreements, or laws which were believed to bring prosperity, and success, however those policies as a result were created in the U.S. best self-interest. One of these policies is known as NAFTA, which was a trade agreement created to open up free trade around the globe, however this policy backfired, deeply scaring and deteriorating the Latin American economy, and its people. Specifically, NAFTA known as the North American Free Trade Agreement, took effect on January 1, 1994 was a treaty which entered by the United States, Canada, and Mexico used to eliminate tariff barriers, in order to encourage economic prosperity between these three countries. A quarter century later, the
& MCMILLAN, S. 2008. Astronomy Today - Sixth Edition, United States of America, Pearson Education, Inc.
The Kuiper Belt is an icy-bodied disc shapes area of the Solar System. Kuiper Belt has a circular shape, to be exact, it is a curved plane. It is over 4.5 to 7.4 billion kilometers from Sun. This is roughly 30 to 50 times the distance of Earth from Sun. The Kuiper Belt has been said to resemble the Asteroid Belt that lies between Mars and Jupiter. The difference between the Kuiper Belt and the Asteroid Belt is that the bodies are icier due to their distance from the Sun. The Kuiper Belt objects includes Pluto and other comets that orbit beyond Neptune. Most Kuiper Belt objects are made up of frozen volatiles such as methane, water and ammonia. In 1950 astronomer Gerald Kuiper predicted the existence of the Kuiper Belt and the find was named
The Earth’s moon is a rare body and there are very few similar to it. NASA has sent many manned and unmanned missions to Earth’s moon in order to answer the many questions they have about its composition and how it got there. The data that these missions yielded helped astronomers to develop these five theories:
...ker further explores the impact of the lack of these promises through discussion of how a faction should approach wining a war. He proposes that the winning side should use only the minimum force needed to win and do so with a cordial and respectful manner so to not incite further revenges and destabilize the region. Without these promises the possibility of “absolute” enemies take rise and are also envisioned by the perspective of anti-terrorists. The identification of such an extreme combatant allows for abuse of ethics and degradation of integrity. Coupled with expanding use of non-lethal weapon exploration, the moral battlefield takes an even more precarious stance. For these reasons, and in agreement with Coker, the of the importance to maintain ethical and moral boundaries when facing a combatant willing to sacrifice all decency cannot be more highly stressed.
On the 1st of January 1994, the North American Free Trade Agreement (NAFTA) came into effect. It eliminated all the major tariffs amongst the countries , of the United States, Canada and Mexico. It has been considered positive by all the major outcomes, but nobody takes in consideration what is really happening. Mexico being our brother country is being negatively impacting its resources, land, and people . Cheap labor and awful working conditions keeps America sky high in its economy. There are many ways that one can change this agreement and make it just for the economy of each country.
NAFTA is trade agreement implemented January 1, 1994 between the U.S., Canada and Mexico which removes restrictions on trade between the three countries to encourage free competition, improve investment opportunities and increase market access "for small and medium-sized enterprises (SMEs)" (Tomasetti, H., 2004). Some of the advantages NAFTA has afforded its members are the eradication of tariffs, product price reductions and increased profit margins. NAFTA has eliminated tariffs on all goods traded betw...
What is a psychopath? What type of person can be characterized by this and how do they come to be? But first before we can answer these questions we must first know what a psychopath is. Psychopaths are people suffering from chronic mental disorder with abnormal or violent social behaviors; clinically it is a person who has a lack of what we would consider a conscience. Psychopaths are seen to suffer from a lack of empathy because of psychological, genetic and environmental factors. Scientists have many theories concerning psychopaths. Scientist do not have a definite clear cut answer on what is the cause for psychopathy but they have many ideas; nature and the nurture of the person. Nature is the genes that the person carries. The nurture of the person when they were a child is simply means how they were treated when they were growing up and/or how they were raised. Some scientists even consider it a possibility that it could be a mixture of the two.
There are five basic theories in the formation of our moon. The first is the "fission theory" which states that the moon was once a part of earth, but separated a long time ago. The second theory is called the "capture theory". This theory is says that the moon formed somewhere else, and was "captured" by earths gravitational pull. The third theory is called the "condensation theory" this theory states that the moon and earth were condemned together from the original nebula that formed our solar system. The fourth theory called the "Colliding Planetesimals Theory" states that the interaction between the earth orbiting the sun, and the sun orbiting planetesimals, which are large Astroid like rocks, led to the breakup and formation of our moon from the debris of these planetesimals. The fifth and final theory is called ...
...lieve that millions of years ago, a piece of rock as big as Mars hit the Earth, and the collision blasted a huge amount of rock into space, and the shattered pieces of rock went into orbit around the Earth. Over millions of years, the rocks clumped together to form the moon, and now it is not the pieces of rock that orbit the Earth, but the moon itself. Scientists, Native Americans, and many other people have their theories of how the moon became, but none have been proven. Scientists have studied the moon for many years, and have proven many theories, but not this one.
Pluto is located 7.5 billion kilometers from Earth and is only over 2,000 km in diameter. Pluto has been labeled both a planet and a dwarf planet over the years. As said by USA Today, “a planet is a celestial body that: is in orbit around the sun, is round or nearly round, and has "cleared the neighborhood" around its orbit, meaning it is not surrounded by objects of similar size and characteristics.” Pluto only follows two of the three rules of a planet. Pluto crosses over Neptune’s orbit and is near other dwarf planets like it. Even though it breaks one rule it was officially named a dwarf planet in “August 2006”, as stated by the Library of Congress. After this event Pluto still only has one correct classification. Pluto is a planet because
The gravitational forces between the Earth and the moon cause some interesting effects; tides are the most obvious. The moon has no atmosphere, but there is evidence by the United States Department of Defense Clementine spacecraft shows that there maybe water ice in some deep craters near the moon's North and South Pole that are permanently shaded. Most of the moon's surface is covered with regolith, which is a mixture of fine dust and rocky debris produced by meteor impact. There are two types of terrain on the moon. One is the heavily cratered and very old highlands. The other is the relatively smooth and younger craters that were flooded with molten lava.
Our solar system has eight planets, their moons and satellites, and they are all orbiting the Sun. The eight planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto used to be the ninth planet but IAU changed the definition of planet and Pluto did not meet the standards so it is now a Dwarf planet.