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Name:Dean Jones
Status: N/A
Age: N/A
Location: N/A
Country: N/A
Date: Around 1999


Question:
A student wishes to know just how we know that the Milky Way is a spiral galaxy. We have seen examples of elliptical, etc., and the model on Laser disc about football-shaped galaxies. Help here, please.



Replies:
Currently it is theorized that there are 3 main types of galaxies:
1) Elliptical,
2) Spiral,
3) Irregular (means no shape at all).

Originally, optical means had shown a single arm during summer months, but now with other technologies, other arms are now "visible". Radio waves (longer wavelength than light) are emitted from the Milky Way. Using telescopes monitoring these waves (Radio Telescopes) other arms of the galaxy and a spherical center have been "observed".

Our sun is located 2/3 of the distances from the center to the edge on one of the arms. The arm is called Orion.

Sysop



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