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Brightness Of Sun And Stars
Test Description: Review of Brightness of Sun and Stars, Constellations
Instructions: Answer all questions to get your test result.
1) Jerome notices that two stars appear to have the same brightness. He knows that one of the stars is much farther away than the other. What could he conclude about the two stars?
A
Both stars must have the exact same actual brightness.
B
Both stars must give off the exact same amount of energy.
C
The one that is farther away must be brighter.
D
The one that is closer must be brighter.
2) A stars' brightness or luminosity can be explained by its...
A
distance from Earth and temperature
B
size and temperature
C
color and life span
D
size and distance from Earth
3) The difference in the brightness of two stars with the same surface temperature is
A
related to their ages
B
related to their colors
C
related to their sizes
D
related to how they formed
4) Compared to other stars, the Sun is __________ in size, brightness and temperature
A
less
B
none of these
C
average
D
more
5) A student learns that the sun is classified as a medium-size star and that many stars are much bigger and brighter. However, the student observes that other stars look very dim. Why do other stars look much dimmer than the sun?
A
The sun appears yellow, which is more visible than other colors.
B
Other stars are made up of different gases than the sun is.
C
As light from other stars travels through space, it gets reflected.
D
The sun is much closer to Earth than other stars are.
6) If you view stars in March, will the stars be in the same location in the night sky in October? Explain.
A
The stars don't move so everything will be in the same location in the night sky.
B
Revolution of Earth on its axis and rotation of Earth around sun, stars will be in a different location/not visible.
C
Stars are constantly moving so they are never in the same location.
D
Rotation of Earth on its axis and revolution of Earth around sun, the stars will be in a different location/not visible.
7) Observed patterns of stars that people use to mark the positions of stars in the sky
A
constellations
B
suns
C
galaxies
D
moons
8) Scientists use the light-year to describe the relationships between objects in space. What does a light-year measure?
A
the brightness of light that travels through space
B
the number of years it takes light to travel to Earth
C
the time it takes light to travel 1 million km
D
the distance that light can travel in one year
9) A light year is the ________ that light travels in one year.
A
energy
B
P x F = D
C
distance
D
frequency
10) Which of the following is NOT a factor that controls the apparent brightness of a star?
A
how old it is
B
how hot it is
C
how far away it is
D
how big it is
*select an answer for all questions
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