A Star
Our Sun
Vocab
Galaxies
Misc.
100
How is a star classified?
By its absolute magnitude and brightness
100
What type of star is our sun?
A main sequence star
100
What is absolute magnitude?
The exact brightness of a star
100
What are the three types of galaxies?
1. Spiral 2. Elliptical 3. Irregular
100
What type of galaxy is the Milky Way in?
A spiral galaxy
200
What is the hottest type of stars?
A blue star
200
How old is our sun?
About 4.6 billion years old
200
What is apparent magnitude?
The brightness a star appears to have
200
What is an elliptical galaxy?
A circular to long, narrow, and cigar-shaped galaxy
200
What are the coldest type of stars?
A brown dwarf
300
What is the life cycle of a star?
1. Protostar 2. Main Sequence Star 3. Planetary Nebula 4. Red Giant 5. White Dwarf
300
What are the three layers of our sun?
1. Core 2. Radioactive Zone 3. Convective Zone
300
What is the H-R diagram?
A scatter graph of stars showing the relationship between the stars' absolute magnitudes, classifications and temperatures
300
What is a spiral galaxy?
The most common type of galaxy and of course are spiral, with long arms winding toward a bright bulge at the center
300
How many stars are visible by the naked eye?
There are about 2,500 stars visible to the naked eye
400
How does a star get its energy?
From nuclear fusion inside a star caused by two hydrogen atoms colliding and forming helium atoms
400
What is the heart of our universe?
The sun
400
What does the H-R diagram stand for?
Hertzsprung–Russell diagram
400
Who discovered the three types of galaxies?
Edwin Hubble
400
What are constellations?
Named patterns of stars
500
What are stars made of?
Big exploding balls of gas, dust and mostly hydrogen and helium
500
What is the suns absolute magnitude?
Absolute magnitude is 4.83
500
What is a binary star?
A star system consisting of two stars orbiting around their common center of mass
500
How many galaxies are there in the universe?
More than 170 billion
500
How many stars are in the Milky Way galaxy?
Astronomers estimate that there are 200 billion to 400 billion stars contained within the Milky Way
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