-
Distance in outer space is measured in terms of
C. light-years
-
Ancient civilizations observed motion of celestial objects at least in part, to enable them to
D. tell time
-
An astronaut on the Moon would observe stars to
A. not twinkle
-
Star-forming nebulae initially rely upon ________ to create a protostar
B. shock waves
-
The interior of an average star is proposed to contain all of the following EXCEPT
A. conduction zone
-
All of the following account for the difference in brightness of stars EXCEPT
B. location in sky
-
Starlight provides astronomers with all of the following information EXCEPT
B. mass
-
Red giant stars are
A. bright, low temperature giants
-
Stars that are faint, very dense, white hot and close to the end of their lifetimes are
C. white dwarf stars
-
Which of these elements are formed in supernova explosions of dying stars?
D. nickel
-
The greater the distance to a galaxy, the greater a red shift in its spectral lines. This is known as
C. Hubble's Law
-
Evidence that points to the existence of black holes was produced by the
B. Hubble Space Telescope
-
The name of our galaxy is the
C. Milky Way
-
The Milky Way is defined by all of the following structures EXCEPT
C. clusters
-
The Milky Way
B. is filled with gas, dust, and molecules.
-
The Milky Way's gravitational attraction is the reason why we have
C. satellite galaxies
-
The scientist who developed a scheme to classify galaxies was
A. Hubble
-
The Big Bang Theory is NOT supported by
C. absence of cosmic background radiation
-
What is the stumbling block to finding extra terrestrial life?
C. distance and time
-
As viewed from the Earth, stars are ________ sources of light
B. point
-
Density differences in the atmosphere result in_________ of star light
C. refraction
-
Planets ________ light
A. reflect
-
Which force is responsible for the collapse of a nebula into a protostar?
C. gravitational
-
Our sun is
C. an average star powered by fusion reactions
-
Interstellar clouds of hydrogen gas with very little gravitational attraction between the hydrogen particles are called
B. nebulae
-
Atoms in the average star absorb and reemit gammarays and x-rays in its
B. radiation zone
-
The brightness of a star at a defined standard distance is
C. absolute magnitude
-
The brightest star in the night sky is called
B. Sirius
-
The color of a hot star is
A. blue-white
-
The color of a star is related to its
D. surface temperature
-
The temperature-luminosity graph used to classify stars was developed by:
D. Hertzsprung and Russell
-
The narrow band of stars that moves from the top left to the bottom right of the Hertzsprung-Russell diagram is the
B. main sequence
-
The period-brightness relationship of a Cepheid variable star allows astronomers to measure stellar
A. distance
-
Our sun is considered _________ based on the Hertzsprung-Russell classification of stars
A. main sequence
-
The lifetime of a star depends on its
B. mass
-
The stages in the life of a star are
C. protostar, main sequence, red giant, white dwarf
-
Less massive stars grow old and expand and contract which results in its outer layer being blown off into space. The outer layer forms a
D. planetary nebula
-
Fusion reaction stages continue in massive stars until the element ______ is formed
C. iron
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