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STARS AND CONSTELLATIONS REVIEW
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The constellation that contains the Sirius star
Canis Major
It forms the keel of a boat known as Argo Navis
Carina
It contains the asterism known as Northern Cross
Cygnus
Noted for the five-star asterism that forms the letter W
Cassiopeia
The constellation that contains the Polaris
Ursa Minor
The two star pointer that helps in locating the Polaris
Dubhe and Merak
The constellation the contains the seven-star dipper asterism and is also considered as the third largest constellation
Ursa Major
What are circumpolar constellations?
Constellations that can be seen all year round
What is a Planisphere?
A rotating star locator that can be adjusted to display visible stars for any time and date
The British Astronomer who discovered that stars move and change positions
Edmund Halley
These are sections of the sky with recognizable patterns of stars
Constellations
What causes star trails?
The Earth's Rotation. Stars in the Northern hemisphere appear to rotate around Polaris.
Why do stars twinkle?
The twinkling of the stars is an illusion created by the moving air in the atmosphere that bends the light moving in a straight line
These are stars with more than 10 times the size of the sun
Super Giants
What are the three major classifications of stars according to size?
Dwarf, Giant, and Super giant
What is the temperature range and color of a type O star?
Bluish in color, 30,000 to 80,000 k temperature
What is the function of a Stellar Spectra?
It contains the information about the star's temperature, chemical composition, and intrinsic luminosity
Why do hottest stars appear bluish to white?
Because they emit their energy in the blue to UV wavelengths
How does the color of a star relate to its temperature?
Cooler stars appear reddish while hotter stars appear bluish
What factors affect the luminosity of a star?
Size and Surface temperature
It describes the rate at which a star radiates energy
LUMINOSITY
What is the top 1 brightest star as seen from Earth?
SUN
It is considered as the brightest star in the night sky with an absolute magnitude of 1.4
Sirius
What is absolute magnitude?
Brightness measured at 10 parsecs from the Earth
It is the brightness measured at actual distance from the Earth
Apparent Magnitude
What are the two factors that affect the brightness of a star?
Size and Distance from Earth
He devised a scale of 1 to6 to describe the apparent magnitude of a star
Hipparchus
Give at least three constellations that can be seen in the Southern Hemisphere?
Southern Cross, Carina, and Centaurus
Give at least three constellations that can be seen in the Northern Hemisphere?
Ursa Major, Ursa Minor, Cassiopeia, and Cygnus
What are the five major characteristics of Stars?
Color, Temperature, Size, Brightness, and Composition
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