The Sun & Stars
What is a star? Stars are huge bodies of hot glowing gas, that  give off energy in the form of heat and light.
How do stars differ from one another? Stars can be different  from each other in  temperature, size, an  d brightness. T...
What does the color of astar tell us? The color of a star tells us its temperature. Hotter stars-blue Cooler stars-red...
How old is our star? Our sun is about 5 billion years old. It is a  middle-aged star, meaning it has about  another 5 bil...
What makes up our star? The sun is made up of hydrogen  and helium. Inside the sun, nuclear reactions  are taking place....
What kind of energy does theEarth get from the sun? Earth receives electromagnetic  energy from the sun. This  brings the...
Looking at the Hertzsprung- Russell (H-R) diagram: Absolute magnitude is how  bright a star actually is The brighter a s...
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Sun & stars

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Sun & stars

  1. 1. The Sun & Stars
  2. 2. What is a star? Stars are huge bodies of hot glowing gas, that give off energy in the form of heat and light.
  3. 3. How do stars differ from one another? Stars can be different from each other in temperature, size, an d brightness. The Hertzsprung- Russell (H-R) diagram shows these differences.
  4. 4. What does the color of astar tell us? The color of a star tells us its temperature. Hotter stars-blue Cooler stars-red Our sun is a yellow star.
  5. 5. How old is our star? Our sun is about 5 billion years old. It is a middle-aged star, meaning it has about another 5 billion years. The solar system formed at the same time as the sun, and therefore, has the same age.
  6. 6. What makes up our star? The sun is made up of hydrogen and helium. Inside the sun, nuclear reactions are taking place. Two atoms of hydrogen are being forced together, due to the rapid speed at which they are moving, forming helium. When this happens, large amounts of energy are being released, like atomic bombs constantly going off.
  7. 7. What kind of energy does theEarth get from the sun? Earth receives electromagnetic energy from the sun. This brings the light and heat from the sun to the earth. It includes such types of energy waves, such as:  U-V waves  Infrared waves  Microwaves  Gamma waves  Visible light
  8. 8. Looking at the Hertzsprung- Russell (H-R) diagram: Absolute magnitude is how bright a star actually is The brighter a star is, the lower the absolute magnitude There are 4 groups of stars that fall into the H-R diagram (supergiants, giants, main sequence, and white dwarfs)

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