Question 1

Which of these molecules is likely to be the MOST common in interstellar space?

Accepted Answer

A)  OH, hydroxyl 
B)  H2, molecular hydrogen 
C)  CO, carbon monoxide 
D)  H2O, water 
A)  OH, hydroxyl 
B)  H2, molecular hydrogen 
C)  CO, carbon monoxide 
D)  H2O, water

Question 2

If astronomers plotted the stars in a young star cluster on a Hertzsprung-Russell diagram, they would expect to see

Accepted Answer

A)  all the stars on the main sequence. 
B)  the more massive stars above the main sequence and the less massive stars on the main sequence. 
C)  some stars on the main sequence and others above the main sequence, in random fashion, depending on when each star condensed from the interstellar cloud. 
D)  the more massive stars on the main sequence and the less massive stars above the main sequence. 
A)  all the stars on the main sequence. 
B)  the more massive stars above the main sequence and the less massive stars on the main sequence. 
C)  some stars on the main sequence and others above the main sequence, in random fashion, depending on when each star condensed from the interstellar cloud. 
D)  the more massive stars on the main sequence and the less massive stars above the main sequence.

Question 3

The Pauli exclusion principle states that two identical electrons (or other particles) cannot have the same

Accepted Answer

A)  electrical charge at the same time. 
B)  speed at the same time. 
C)  position, speed, and direction at the same time. 
D)  speed and direction at the same time. 
A)  electrical charge at the same time. 
B)  speed at the same time. 
C)  position, speed, and direction at the same time. 
D)  speed and direction at the same time.

Question 4

Which of these mechanisms is thought to be ineffective and inefficient in the triggering of star birth in molecular clouds?

Accepted Answer

A)  gravitational contraction of a hot gas cloud 
B)  collisions between two interstellar clouds 
C)  supernova explosions and the resultant shock waves 
D)  radiation pressure from the intense UV radiation from hot stars 
A)  gravitational contraction of a hot gas cloud 
B)  collisions between two interstellar clouds 
C)  supernova explosions and the resultant shock waves 
D)  radiation pressure from the intense UV radiation from hot stars

Question 5

Protostars, when they first form from the interstellar medium, are usually

Accepted Answer

A)  very bright in ultraviolet light due to numerous flares that are hotter and brighter than solar flares. 
B)  detected by emission lines in their visible spectra, emitted by gas being blown off their surfaces into space. 
C)  easily detected because their light ionizes the surrounding interstellar gas, or reflection nebulae. 
D)  hidden from sight by dust clouds that emit infrared radiation. 
A)  very bright in ultraviolet light due to numerous flares that are hotter and brighter than solar flares. 
B)  detected by emission lines in their visible spectra, emitted by gas being blown off their surfaces into space. 
C)  easily detected because their light ionizes the surrounding interstellar gas, or reflection nebulae. 
D)  hidden from sight by dust clouds that emit infrared radiation.

Which of these molecules is likely to be the MOST common in interstellar space?

If astronomers plotted the stars in a young star cluster on a Hertzsprung-Russell diagram, they would expect to see

The Pauli exclusion principle states that two identical electrons (or other particles) cannot have the same

Which of these mechanisms is thought to be ineffective and inefficient in the triggering of star birth in molecular clouds?

Protostars, when they first form from the interstellar medium, are usually

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Exam 13: The Lives of Stars From Birth Through Middle Age

Which of these molecules is likely to be the MOST common in interstellar space?

If astronomers plotted the stars in a young star cluster on a Hertzsprung-Russell diagram, they would expect to see

The Pauli exclusion principle states that two identical electrons (or other particles) cannot have the same

Which of these mechanisms is thought to be ineffective and inefficient in the triggering of star birth in molecular clouds?

Protostars, when they first form from the interstellar medium, are usually

Discovering the Night Sky

Gravitation and the Motion of the Planets

Light and Telescopes

Atomic Physics and Spectra

Exoplanets and the Formation of Planetary Systems

Formation of the Solar System

Earth and the Moon

The Other Terrestrial Planets

The Outer Planets

Vagabonds of the Solar System

The Sun: Our Extraordinary Star

Characterizing Stars

The Death of Stars

Black Holes: Matters of Gravity

The Milky Way Galaxy

Galaxies

Quasars and Other Active Galaxies

Cosmology

Astrobiology

Filters