Light from Stars
Where is energy produced inside a star?
A. Surface
B. Atmosphere
C. Core
D. Rays
C. Core
What unit do scientists use to measure distances between stars?
A. Meters
B. Miles
C. Kilometers
D. Light-years
What does apparent brightness describe?
A. How much light a star gives off
B. How bright a star looks from Earth
C. How hot a star is
D. How large a star is
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B. How bright a star looks from Earth
How does size affect a star’s brightness?
A. Smaller stars look brighter
B. Larger stars usually look brighter
C. Size does not matter
D. Only small stars give off light
What do scientists call the straight lines that light travels in?
A. Waves
B. Paths
C. Beams
D. Rays
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D. Rays
A light-year is a unit of —
A. Distance
B. Speed
C. Time
D. Brightness
A. Distance
Why does the Sun appear brighter than other stars?
A. It is the hottest star
B. It is the biggest star
C. It is closer to Earth
D. It gives off more light
C. It is closer to Earth
A star’s radius is the distance from the —
A. Surface to space
B. Center to surface
C. Core to atmosphere
D. Earth to star
B. Center to surface
Why do stars appear as tiny points of light from Earth?
A. Stars are small
B. Stars give off little light
C. Most of their light spreads out before reaching Earth
D. Earth blocks their light
C. Most of their light spreads out before reaching Earth
About how far does light travel in one year?
A. 9.5 million km
B. 9.5 billion km
C. 9.5 trillion km
D. 9.5 thousand km
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C. 9.5 trillion km
Stars that are farther away usually appear —
A. Larger
B. Hotter
C. Faster
D. Dimmer
D. Dimmer
How does temperature affect apparent brightness?
A. Hotter stars are brighter
B. Cooler stars are brighter
C. Temperature doesn’t matter
D. Only red stars are bright
A. Hotter stars are brighter
What happens to light as it travels farther from a star?
A. It speeds up
B. It spreads out
C. It stops
D. It changes color
B. It spreads out
Light from the Sun takes about how long to reach Earth?
A. 8 seconds
B. 8 minutes
C. 8 hours
D. 8 days
B. 8 minutes
Even stars that give off the same amount of light can look different because of —
A. Color
B. Distance
C. Age
D. Shape
Scientists use this to tell how hot a star is —
A. Size
B. Distance
C. Color
D. Shape
C. Color
Stars only look small because they are —
A. Far away
B. Older
C. Colder
D. Moving
A. Far away
If a star is 4.3 light-years away, how long does its light take to reach Earth?
A. 4.3 minutes
B. 4.3 months
C. 4.3 years
D. 43 years
C. 4.3 years
Alpha Centauri A looks dimmer than the Sun because it is —
A. Smaller
B. Cooler
C. Older
D. Farther away
D. Farther away
Which color stars are the hottest?
A. Red
B. Yellow
C. White
D. Blue
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D. Blue