15

A green flash can occur at sunrise or sunset when some part of the Sun suddenly and briefly seems to change color from red or orange to green or blue. This is an optical effect caused by the larger refraction of light at the blue/ green end of the spectrum…

0

A quick description of how hot air balloons work.

0

For decades, Mojave has been considered America’s premiere civilian aerospace research, development and test center. Dozens of cutting-edge aerospace companies – such as Dick Rutan’s Scaled Composites – are located here and still make aviation history.

0

An interesting article I found in a book about the discovery of matter. Enjoy.

3

Global Warming is turning into a crisis. I give my feedback on it now.

0

When we ask about the weather, we usually want to know how hot or how wet it is. Find out more about it.

26

As the plane cuts through the air, the air that flows over the top of its wings has to travel a greater distance than the air flowing underneath its wings. So the air has to travel faster over the top than the bottom. Hence the air pressure on the top and bottom of the wings produces an upward force or lift that pushes the wings upwards.

35

We need air to breath. But if the air we breathe is no longer clean, it compromises our health.

0

All information I have about the planets in our galaxy.

0

The maglev sure is a train of the future and an icon for the city of Shanghai. It has left all have travelled in it and others who’ve watched it awestruck by its beauty, speed and elegance.