What is one thing stars are classified by (name one)?
What is temperature, color, age, apparent brightness, and distance from earth?
100
Where is the sun located on the chart?
What is the main sequence.
100
When Hydrogen is converted into Helium in its core, why does it gradually becomes more luminous
The core density and temp. rises slowly
100
What direction do all stars start?
The same way as the sun
200
What is color related to?
What is temperature
200
What appears in the lower left corner?
What is white dwarfs.
200
The 10% of inner mass go under nuclear reactions because temp. outside the core aren’t hot enough to burn
Some hydrogen continues to react in a thin layer at the outer edge of the helium core. What happened?
A red giant was formed
200
What is the foundation of formation of stars?
Condensastion of gases due to gravity
300
What color is hotter red or blue
What is blue?
300
What group appears in the upper right corner?
What is red giants?
300
The energy created in forming a red giant forces the star to what?
expand and cool
300
A star starts with a nebula-interstellar gas and dust- which collapses on its self as a result of what?
Gravity
400
What is the differenve between apparent brightness and apparent magnitude?
Apparent brightness is how bright the star is to us. Apparent magnitude is how bright the star really is.
400
What are the labels on the x and y axis?
What is X is surface tempature, y is absolute magnitude.
400
When does a star lose luminosity?
When it becomes a white dwarf
400
As the nebula contracts its rotation forces it into a disc shape with a hot condensed object at the center called a what?