The universe

Class: 6

Date: March 24/2010

Item: The universe

Nebula: Is a cloud of dust, hydrogen gas, helium gas and plasma.

Nebula attract cosmic gas and dust, where they are very large form stars and planets.The most important nebula is called Crab Nebula.

Constellations: They are totally imaginary things in the space that the astronomer and poets have made up over the past 6000 years.

Are groups of stars that have joined with imaginary lines, the form figures and they are used in navigation and guidance. Some constellations are:

Orion The great bear

The names correspond to the Greek mythology.

Pulsars: It is a neutron star this; this is one of the posible end of a star.

The internal activity of this star is so strong that electrons and protoms unite to form neutrons.

Quasar: there are the largest sources of energy in the universe, are as bright such as a hundred galaxies but less large