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Lesson 13: Stars
Nebulae (plural for Nebula)
Stellar Nebula-
Nebulae (plural for Nebula)
Stellar Nebula-
A gigantic cloud of gas and dust from which stars
are made
Nebulae (plural for Nebula)
Stellar Nebula-
A gigantic cloud of gas and dust from which stars
are made
“Stellar Nursery”
Nebulae (plural for Nebula)
Planetary Nebula-
Nebulae (plural for Nebula)
Planetary Nebula-
When a star runs out of fuel, its outer layers of gas
are blown outward.
Nebulae (plural for Nebula)
Planetary Nebula-
When a star runs out of fuel, its outer layers of gas
are blown outward.
Does not create planets!
A Star is Born…
A star is made of gas in a small volume.
A Star is Born…
A star is made of gas in a small volume.
All stars begin their lives as parts of stellar
nebulas.
A Star is Born…
Gravity pulls gas and dust in a nebula
together.
A Star is Born…
Gravity pulls gas and dust in a nebula
together.
The contracting cloud called a protostar.
A Star is Born…
Gravity pulls gas and dust in a nebula
together.
The contracting cloud called a protostar.
A star is born when nuclear fusion begins.
Classifying Stars
Color
Temperature
Size
Composition
Brightness
Star Temperature
Surface Temperature = Color
Blue-white White yellow orange red
Hottest *Sun coolest
Compare the sizes of Stars
Our Sun is a medium sized Star
Star Brightness (magnitude)
Absolute Magnitude: the “Real”
brightness of the star. How much
light it really gives off.(Need to
know the distance to the Star)
Apparent Magnitude: How bright
the star appears to be.
Star Distance
Measured in Light-Years
Light-Year: The distance light travels in a year. (9.5 million million Kilometers)
5.87849981 × 1012 miles (6 trillion miles)
Speed of light: 186,000 Miles/second
300,000 Kilometers/Second
Finding the Distance to Stars
Parallax: The “apparent “ shift
that a star has over a period of
Time
The closer the object, the more
it will shift position in the sky
*
Background Star
H-R DiagramHertzsprung-Russell Compares star temperature and Brightness
