Galaies And Beyond

Vocabulary 11

 

Galaxy: a large group of stars held together by the gravity.

Milky way: our home galaxy.

Spectrum: a band of colors made when light white light is broken up.

Expantion redshift: the shift of a spectrum of a galaxy toward longer (redder)wave lents to do the expansion of space.

Big bang: the bigining of the univers, when the densyty of the universe was very haight.

Background radietion: electromagnation radiotion left over the bing bang,

Quasar: an extrimly bright, extrimly distant,hight energy source.