are we star dust Free Essay, Term Paper and Book Report
What is a Star?
We see many points of light on a clear, dark, moonless night. Some are bright, others barely visible. If we look carefully we can make out colours. The bright star Vega (overhead in the Northern Hemisphere summer) is white; Capella (overhead in the winter) is yellow; Regulus (of Leo) is blue, Arcturus (a springtime star) is orange; Antares (from the Greek "rival of Mars" - brightest star is Scorpius) is, of course, red.
At first glance it may seem a difficult thing to find out anything about the stars. But by using the gas laws and the laws of thermodynamics it is possible to find out about their physical conditions. Using atomic physics and the laws of radiation (like light) we can find out about their chemistry.
Although stars are very distant, we are lucky to have one very close to us: the Sun. The Sun is a typical star.
Light (travelling at 300,000 km per sec) goes seven times around the Earth in one second. From the Sun it takes just 8.3 minutes to reach us (from a distance of 149 million km). The nearest star after the Sun is so far away that light takes......
Word Count: 3169
Page Count: 12.6 (250 words a page / double spaced)
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