Wednesday, October 24, 2007
It is the name given to our Galaxy, which is shaped like a disc with a central bump. It is also the name for the dense band of stars that spans the sky. As a galaxy, the Milky Way is actually a giant, as its mass is probably between 750 billion and one trillion solar masses, and its diameter is about 100,000 light years.
Thursday, September 27, 2007
It is an instrument for producing and photographing a spectrum. Used to measure properties of light over a specific portion of the electromagnetic spectrum.
Sunday, September 16, 2007
Most (though not all) paper is made from wood. Logs are stripped of bark, chopped into very small pieces and then pulped. The pulping stage is important, for at that time various chemicals and things like clay, or old rags, or even straw, are added, which determine the quality, colour and smoothness (or roughness) of the finished paper. Once pulped, the paper is rolled into sheets which are dried out before being cut to required shapes and sizes.
Thursday, September 13, 2007
From the French for shop, the word is now used to indicate a particular kind of small store that specializes in ready-made fashion clothes, and perhaps crafts, scents and soaps.
Wednesday, September 5, 2007
It is a dialled meter for showing how high an aircraft or spacecraft is above ground. Most altimeters work using air pressure. The measurement of altitude is called altimetry
Wednesday, August 29, 2007
It is a piece, or pieces, of apparatus for measuring physical changes from a distance. It has wide application in space technology.
Jupiter is the fifth planet from the Sun and the largest planet within the solar system. It is two and a half times as massive as all of the other planets in our solar system combined.It is about ten times the diameter of the earth, and rotates on its axis in about ten hours, which is faster than Earth.