- Education and Science»
- Astronomy & Space Exploration
Welcome To Earth! - A Look at our Solar System and Core!
WELCOME TO EARTH!
Welcome to Your Galaxy. Today we are going to be taking a tour of the most exciting part of “The Milky Way Galaxy” that’s right. Earth! What’s so special about earth you may ask? Well it’s a super rare planet in the galaxy, the atmosphere is rich in oxygen’s and dioxides. The soil is rich in nutrients and minerals. And it’s the only planet we Humans call home!
The first stop on our tour is the galaxy in which our planet resides in. “The milky way galaxy” is approx. 200,000 light-years across in this picture of our Milky Way Galaxy, we see it as it was 200,000 years ago. Because the light from those stars took 200,000 years at the speed of light to reach our telescope lenses. At the centre of every galaxy is a BLACK HOLE, probably the most dreaded and complex body’s in the universe. With anti-matter principles the black hole devastatingly crushes all matter including suns and whole galaxy’s!
Unknown to many, is our galaxy is actually on a collision course with a sister galaxy roughly the same size as our own known as the Andrameda Galaxy. Our galaxy’s black hole is a few times greater in size than the mass of our sun. While the galaxy we are supposed to collide with has a black hole about 100 times the mass of our sun. But fear not, this is not supposed to even begin for another few hundred thousand years.
Everything you dont know about your planet!
The next stop on our galactic journey is the solar system where earth spins around the sun. 8 planets, 167 moons and an impressive asteroid belt orbit the Sun or Sol (Sun’s name) there have even been some more planets discovered! These dwarf planets are more like giant moons or asteroids that have formed with the sun and other planets and have taken on a rotation within the suns gravitational pull.
But our eight planets remain intact and spinning. The sun (Sol) was created when another star exploded 5 billion years ago. The debris and gas from that explosion formed under the intense gravity that pulled the explosion backwards. The jovial (gas planets) and terrestrial (rock planets) were formed this way. Earth is special it is the only planet in our solar system, galaxy, and universe that we know of that has experienced a tropical stage, there is some evidence that mars began to, but maybe its moon splitting in too, or being too far away from the sun, or other unknown factors kept it from fully maturing like earth did. Earth has been tropical for at least 250 million years. In that time an estimated 6 extinction events like ice ages and comets have impacted the planet. It has been said that if you look at the life cycle of earth as a 24/hr clock. Humans are the last 2 seconds on the clock.
The moon, has been a huge factor in our planets evolution, the tides of all waters on earth rise and set with the moon. The moon has always showed us one face, that means all the craters in the moons face where debris kicked off from earth, mostly chunks of silicates and other plastic like materials that would have been excreted during earths volcanic period.
Sol sometimes emits solar flares that spew radiation and plasma into space. The most current one was actually this month (march, 2011) Earth would never have seen a single tropical day if not for its unique magnetosphere! Only planets with rotating cores can produce a magnetosphere. Ours is generated from our thick iron core.
The magnetosphere protects our planet from radiation and solar winds which would contaminate the soil and airs. And all cells that exist in the ecosystem below.
This takes us to our final destination: Earth (Your Home)
Beneath Earth’s crust, extending down about 1,800 miles (2,900 kilometers), is a thick layer called the mantle. The mantle is not perfectly stiff but can flow slowly. It is made generally of plastics and plant/earth material, Earth's crust floats on the mantle such as a board floats in water. Just as a thick board would rise above the water higher than a thin one, the thick continental crust rises higher than the thin oceanic crust. The slow motion of rock in the mantle moves the continents around and cause earthquakes, volcanoes, and the formation of mountain ranges.
At the center of Earth is the core. The core is made mostly of iron and nickel and possibly smaller amounts of lighter elements, including sulphur and oxygen. The core is about 4,400 miles (7,100 kilometers) in diameter, slightly larger than half the diameter of Earth and about the size of Mars. The outermost 1,400 miles (2,250 kilometers) of the core are liquid. Currents flowing in the core are thought to generate Earth's magnetic field. Geologists believe the innermost part of the core, about 1,600 miles (2,600 kilometers) in diameter, is made of a similar material as the outer core, but it is solid. The inner core is about four-fifths as big as Earth's moon.
Earth gets hotter toward the center. At the bottom of the continental crust, the temperature is about 1800 degrees F (1000 degrees C). The temperature increases about 3 degrees F per mile (1 degree C per kilometer) below the crust. Geologists believe the temperature of Earth's outer core is about 6700 to 7800 degrees F (3700 to 4300 degrees C). The inner core may be as hot as 12,600 degrees F (7000 degrees C)--hotter than the surface of the sun. But, because it is under great pressures, the rock in the center of Earth remains solid.
Most people don’t know that there are two types of water on the planet (yes, obviously salt and fresh water) I mean there is surface water which we know and enjoy. Then there is “compressed” water that makes up the majority of our sea water, this thick/heavy water is created by gravity from the earths core, as salt water is electrically charged.
Topside, Earthlings (Humans) enjoy a variety of climates, ranging from sandy beaches, to artic mountains. From swampy jungle and brush to harsh savannah. Over 300 different races of humans exist or have existed on this planet.
There has been an estimated 6+ world wars on this planet already. 2 since the industrial revolution. Scientists and computers designed to assess contributing factors estimate a 30% chance of a world war by the end of 2012.
This is a beautiful planet, not to be taken for granted. A jewel of space, a diamond in the rough.