Sunday, March 6, 2011
whats the difference?
the difference between a star a planet and a satellite is that a star gives off light and is made of gasses like hydrogen. the sun gives off light by creating photons, created by atoms colliding and fusing two or three atoms together and creating one photon wich we would see as light." how do these atoms collide, just out of random?" no these atoms collide because of the dense gasses clumping into small groups and bumping together, if you have ever been to las vegas it would be that dense exept the atoms are moving at thousands of miles an hour. "well doesent the moon shine" no, it doesent. the moon only reflects light, not make it, the moon is pure dust and rock, there is no gasses or thousand mile atoms or photons just dust. but the moon creats this effect of light because of its reflective surface that can reflect light. the earth does the same, but we are not dust earth has water and life and it still reflects light by the water and the light hitting the earth.
how the earth and sun were created
Planet earth was formed about 4.6 billion years ago. The earth didn't just appear out of thin space, it took billions of years for it to resemble what it is today. Earth formed from a giant cloud of rock and dust that was trillions of miles wide, as did all of the other planets. This cloud of dust and rock was orbiting around the sun due to the gravitational pull. Bigger rocks took in smaller rocks and even bigger rocks took in those rocks making a massive ball of rock and dust. After a while, the ball was big enough to resemble a planet.
In it's early days, the earth was bombarded with meteors and comets almost constantly and the extreme heat melted the rock. There were constant lightning storms and volcaninc eruptions which superheated the rocks melting them into liquid. This melted rock is what the core of the earth is made of. It is believed that a giant comet/meteor slammed into the earth knocking a chunk of rock into space which orbits the earth to this day known as the moon. After millions of years the earth cooled and formed into Pangaea and all of the other super land masses until it shaped itself into what it is today.
How the Earth was formed - The Power of the Planet - BBC Two
how the sun was formed-THE SUN Encyclopedia of Secrets # part 1 of 5
How the Earth was formed - The Power of the Planet - BBC Two
how the sun was formed-THE SUN Encyclopedia of Secrets # part 1 of 5
Thursday, February 24, 2011
satelites and moons
Did you know that the moon doesent actually create light it only reflects it. the same with the other planets in the same solar system?
Here are some links.
Here are some links.
Visualization of the Coriolis and centrifugal forces
trip to space!
Hello everyone and welcome aboard! I hope you have the most amazing trip of your life! On the way you will learn about the stars, planets, and much more!
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The Sun was basically formed by a bunch of gases and dust, mainly hydrogen, fused together and created an immense star.
Gravity is the force that pulls all mass toward itself. It is a very weak force, but it goes on forever.
About 5 to 6 billion years ago, a cloud of space gas probably received some sort of a shock; possibly the shock wave of a nearby supernova explosion. The gas cloud - mostly hydrogen - had probably been swirling around slowly in space as it orbited the center of the galaxy, but the shock wave caused it to begin to collapse.
As gasses fall together, they compress and heat up. Most of the mass fell to the center of the spiral, and at some point the heat and pressure of the hydrogen suddenly caused the hydrogen atoms to fuse into helium. That was it; the ignition of the Sun. It has been going ever since, about 4.5 billion years now.