S t r u c t u r e o f t h e u n i v e r s e
In 1986 Margaret Geller and her colleagues made a map of 1,000 nearby galaxies . Geller called the image the "stick-man" because it look like a stick figure with arms outspread . More important the stick-man shows the galaxies are grouped together into sheet , or bubbles , rather than spread evenly through the universe . The blue dots are spiral galaxies like our own and the red dots are elliptical ones .
G a l a x y
Stars ( and the planet around them ) collect into galaxy , which are the basic building blocks of the universe . Galaxies contain billions of stars . The milky way , is home to our star , the sun
C l u s t e r
Cluster may hold up to several thousand galaxies . Our galaxy , the milky way , is part of a rather small cluster called the Local group . It is home to about 30 galaxies .
S u p e r c l u s t e r
Super cluster are immense group of galaxies and cluster of galaxies .They contain as many as 20,000 galaxies in one group .
No comments:
Post a Comment