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If two pieces of metal touch in space, they become permanently stuck together. Two pieces of metal without any coating on them will form in to one piece in the vacuum of space. This doesn't happen on earth because the atmosphere puts a layer of oxidized material between the surfaces. This might seem like it would be a big problem on the space station but as most tools used there have come from earth, they are already coated with material. In fact, the only evidence of this seen so far has been in experiments designed to provoke the reaction. This process is called cold welding.
You could watch partial solar eclipses on every planet in our solar system with a moon. But earth is the only planet where a full or total solar eclipse can be seen. It turns out that So when the moon comes between the sun and the earth a small portion of earth experiences a total solar eclipse, meaning the sun is fully blocked out by the moon.
When a total solar eclipse occurs, the sun is fully blocked out by the moon darkening the earth and providing a unique glimpse of the sun's atmosphere or corona. Normally the sun's corona is overwhelmed by the sun's brightness, but in an eclipse the moon so completely shuts out the sun that the corona shines brightly for a few minutes. It is then that scientists can measure the light spectrum of the corona which reveals what is burning inside the sun. Otherwise we would not be able to measure the elemental makeup of the sun. So the fact that earth experiences a total eclipse of the sun makes our planet unique in the solar system with respect to what we can learn about what goes on in the sun's interior.
This is b/c our moon is 1/400th the size of the sun and the sun is 400 times farther away from earth than the moon. It is like it was made that way on purpose just so we can learn of God's creation.
The question “Why is the Sky Blue?” is probably the most asked science question by kids in the world. The first steps to answering this question occurred when Sir Isaac Newton split ordinary white light down into its constituent colors ---
The final piece of the puzzle as to why the sky was blue was put in place by John Tyndall in 1859. He discovered that if you have a clear liquid and mix in some very small molecules the blue portions of the white light are scattered more than any other. You can test this at home with some water in a bottle and adding either milk or a small amount of soap. The image below replicates this experiment – there are two bottles filled with water, the one on the right has just ordinary tap water in it, the bottle on the left has tap water and a small amount of soapy water mixed in. As you can see they both have the same white beam passing through them, yet the one with the soapy molecules in it clearly has a more blue color to it. This is The Tyndall Effect in operation.
It is the Tyndall Effect that explains why the sky is blue. the Tyndall Effect can also be called Rayleigh Scattering, as it was examined more extensively by Lord Rayleigh in the years following Tyndall’s discovery.
So now that we know how molecules can change the color of light, we then need to transfer the experiment above with Earths atmosphere and why our sky is blue -
As sunlight passes through our atmosphere it interacts with the molecules of Oxygen and Nitrogen in the atmosphere. These two elements scatter the blue light in all directions in a similar way to which the light was scattered by the soapy water in the image above.
