Stars Galaxies and The Universe Stars What is

Stars � What is a Star? � A star is a huge ball of

Classifying Stars � Stars are classified by their temperature. � Blue stars- above 30,

Brightness � Apparent magnitude- The brightness of a light or star. � Absolute magnitude-

Parallax � Parallax is a stars apparent shift in position. � For example…… Each

Motion of Stars � Stars actually do move but they move at a very

Types of stars �A new star is made up of gas and dust held

Red Giant � Red giants are stars that are at the end of their

White Dwarf � White dwarf are the remains of the center of other stars.

Supernova’s and Black Holes �A supernova is when an old star finally explodes and

H-R Diagram � This diagram is used to judge the relationship between a stars

Absolute and apparent Magnitude � Absolute magnitude is judged by the HR diagram. The

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Stars, Galaxies and The Universe

Stars � What is a Star? � A star is a huge ball of gas that is Trillions of miles away!! That is 1, 000, 000 miles away! � We study stars by the light they give off. � What do the colors of different start mean? � Well scientist say that yellow/red is a warm color and blue to be very hot.

Classifying Stars � Stars are classified by their temperature. � Blue stars- above 30, 000 degrees C � Blue-white – 10, 000 to 30, 000 degrees C � Yellow white- 6, 000 – 7, 500 degrees C � Yellow- 5, 000 to 6, 000 degrees(the sun) � Orange- 3, 500 to 5, 000 degrees C � Red- Less than 3, 500 degrees C

Brightness � Apparent magnitude- The brightness of a light or star. � Absolute magnitude- the actual brightness of a star if all stars where the same distance from earth.

Parallax � Parallax is a stars apparent shift in position. � For example…… Each night the stars in the sky shift from position to position in the sky because of the earths rotation and position around the sun. � The star is not moving but it seems as though it is.

Motion of Stars � Stars actually do move but they move at a very slow rate toward earth. It would take hundreds of years for a star to move just a few feet in the sky.

Types of stars �A new star is made up of gas and dust held together by gravity. � As a star grows it loses some of its materials until it burns out. � Red Giant, White Drarf, Main Sequence, supernova, neutron star, pulsar, Black Hole.

Red Giant � Red giants are stars that are at the end of their life cycle and can be up too 100 times larger than our sun.

White Dwarf � White dwarf are the remains of the center of other stars. They are very hot and can burn for billions of years before burning out.

Supernova’s and Black Holes �A supernova is when an old star finally explodes and creates a flash of light that may last for several days. � Black Holes are objects that are very massive and dense. They have so much gravity that light cant even escape or leave.

H-R Diagram � This diagram is used to judge the relationship between a stars surface temp and it brightness.

Absolute and apparent Magnitude � Absolute magnitude is judged by the HR diagram. The smaller the number the brighter the star. The larger the number the dimmer the star. � Apparent Magnitude is how bright it looks from earth. � The sun looks really bright but its an average star. If it were the same distance as the other stars then we would barley be able to see it.