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38 Cards in this Set
- Front
- Back
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What is the sun? |
The sun is a star. |
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What is the sun made of? |
It is made mostly of hydrogen |
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What is the closest star to Earth? |
The sun is the closest to Earth. |
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What is the largest object in our solar system? |
The sun is the largest object in our solar system. |
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What does the sun do? |
It is so hot that gas glows and lights/warms the planets. |
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What are the sun spots? |
They are the darker/outer regions of the sun. |
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Who discovered that the sun had spots? |
Galileo discovered this. |
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What is the suns solar flares? |
The solar flares are streamers of high energy of subatomic particles into space. |
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What is the suns photo sphere? |
The photo sphere is the outside glowing region. |
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What is suns solar prominence? |
The solar prominence is streamers of glowing gas that arch into space. |
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What is a star? |
A star is a mass of burning hot gas. |
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What is the nuclear fusion reaction? |
Hydrogen+hydrogen=Helium+energy |
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How old is a blue/white star? |
Young |
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How old is a yellow star? |
Its intermediate. |
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How old is a red star? |
Its old. |
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What is the temperature difference between the blue/white,the yellow and the red stars? |
The younger the star is the higher the temperature is. |
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What star has the highest temperature? |
The blue stars are the hottest. |
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Why are the younger stars the hottest? |
The younger stars are the hottest because as the stars get older they lose energy and their temperature |
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Why do we see more stars in the rural areas than in the city? |
We see more stars in rural areas more because background light hides starlight. |
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How is the stars radius/size calculated? |
It is calculated by knowing its luminously and temperature. |
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What is a light year? |
A light year is the distance light can travel in a year. |
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How long does it takes for light to travel from the sun to earth? |
8 minutes |
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What is the closest star system to our solar system? |
Alpha Centari |
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What is the brightest star in Earths night sky? |
Sirius |
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What is Polaris? |
Polaris is the north star. It is the brightest star in the constellation Ursa Minor (little bear) |
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When a star forms,where is the build-up of temperature and pressure the greatest? |
In the core. |
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Where does hydrogen fusion begin? |
The center. |
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What element is a waste product of hydrogen fusion? |
Helium. |
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Which is heavier helium or hydrogen? |
Helium |
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Where does the helium that is formed during hydrogen fusion go? |
the core |
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Where does hydrogen fusion occur when there is no hydrogen left in the core? |
around the core (center) |
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What temperature is outside the sun |
10000 |
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Apart from its core,the sun is mostly hydrogen. Why does hydrogen fusion take place only in a shell around the sun? |
Not hot enough |
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What will happen to the hydrogen fusion shell as helium accumulates in the center? |
Hydrogen will get pushed out and become less. |
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What will happen to the rate of fusion if the entire region that is hotter than 10 000 000 C is filled with helium? |
It will stop. |
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What will happen to a star when hydrogen fusion ceases? |
It collapses |
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Why is helium in the core of the star instead of hydrogen? |
Its denser |
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Why isn't fusion occurring all the way to the surface of the star? |
Not hot enough |
