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18 Cards in this Set
- Front
- Back
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Q
What unit of measure do we use to measure the distances between stars? |
A
We use LIGHT YEARS. |
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Q
vocab: light year |
A
The distance light travels in one year. |
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Q
vocab: parallax |
A
The apparent change in position of an object when you look at it from two different places. |
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Q
What do astronomers use parallax for? |
A
To measure the distance to nearby stars. |
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Q
What is a star? |
A
They are huge spheres of glowing gas.They are suns basically like our own sun. |
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Q
How do stars make energy? |
A
The fantastic pressure in the core of a star causes Hydrogen atoms to collide hard enough to form a Helium atom and release energy. This process is called Nuclear Fusion. |
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Q
How are stars classified? |
A
1) Size 2) Color (which shows temperature) 3) Brightness |
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What are the five names jused to tell the size of stars?
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A
1) Supergiant 2) Giant 3) Medium (our Sun) 4) White Dwarf (about the size of the Earth) 5) Neutron Star (small) |
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Q
What color are the coolest stars? |
A
The cooolest stars are RED. |
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Q
What color are the hottest stars? |
A
The hottest stars are BLUE. |
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Q
What factors affect how bright we a star looks to us? |
A
1) size 2) temperature 3) distance from the Earth |
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Q
vocab: Apparent Magnitude |
A
A star's brightness as seen from Earth. |
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Q
vocab: Absolute Magnitude |
A
The brightness of a star would have if it were a standard distance from Earth. |
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Q
How does distance affect Apparent Magnitude? |
A
A star looks brighter the closer it is to Earth. |
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Q
What is the Hertzsprung-Russell Diagram? |
A
A graph that relates star's brightness and temperature. |
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Q
On the Hertzspung-Russel Diagram, what is the diagonal line of stars called? |
A
The main sequence. |
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Q
Where does our sun fall on the Hertzsprung-Russell Diagram? |
A
Our sun falls in the Main Sequence of stars. |
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Q
Where are 90% of stars found on the Hertzsprung-Russell Diagram? |
A
In the main sequence. |
