Question 1

What do we mean by a protogalactic cloud?

Accepted Answer

A) a term once used historically to refer to any galaxy 
B) the cloud- like halo that surrounds the disks of spiral galaxies 
C) a cloud of gas that was once a galaxy 
D) a cloud of hydrogen and helium that contracts to become a galaxy 
A) a term once used historically to refer to any galaxy 
B) the cloud- like halo that surrounds the disks of spiral galaxies 
C) a cloud of gas that was once a galaxy 
D) a cloud of hydrogen and helium that contracts to become a galaxy

Question 2

Which of the following observations confirms that Sgr A at the center of our galaxy is indeed a supermassive black hole?

Accepted Answer

A) measurements of occasional X- ray emission from Sgr A 
B) measurements of the orbits of stars around Sgr A 
C) measurements of trans- dimensional space warps in the vicinity of Sgr A 
D) measurements of radio emission from gas around Sgr A 
A) measurements of occasional X- ray emission from Sgr A 
B) measurements of the orbits of stars around Sgr A 
C) measurements of trans- dimensional space warps in the vicinity of Sgr A 
D) measurements of radio emission from gas around Sgr A

Question 3

If you were to take a voyage through the entire disk of the Milky Way, what kind of material would you spend most of your time in?

Accepted Answer

A) hot bubbles of ionized hydrogen 
B) star clusters 
C) rarefied clouds of atomic hydrogen 
D) cool, dense clouds of molecular hydrogen 
E) empty space- a pure vacuum 
A) hot bubbles of ionized hydrogen 
B) star clusters 
C) rarefied clouds of atomic hydrogen 
D) cool, dense clouds of molecular hydrogen 
E) empty space- a pure vacuum

Question 4

What is a shock wave?

Accepted Answer

A) a pressure wave that moves slower than the speed of sound 
B) a pressure wave that moves faster than the speed of sound 
C) an electromagnetic wave that can create electrical shocks 
D) a pressure wave that moves faster than the speed of light 
E) an electromagnetic wave created when electrons recombine with protons 
A) a pressure wave that moves slower than the speed of sound 
B) a pressure wave that moves faster than the speed of sound 
C) an electromagnetic wave that can create electrical shocks 
D) a pressure wave that moves faster than the speed of light 
E) an electromagnetic wave created when electrons recombine with protons

What do we mean by a protogalactic cloud?

Which of the following observations confirms that Sgr A at the center of our galaxy is indeed a supermassive black hole?

If you were to take a voyage through the entire disk of the Milky Way, what kind of material would you spend most of your time in?

What is a shock wave?

A Modern View of the Universe

Discovering the Universe for Yourself

The Science of Astronomy

Making Sense of the Universe: Understanding Motion, Energy, and Gravity

Light: the Cosmic Messenger

Formation of the Solar System

Earth and the Terrestrial Worlds

Jovian Planet System

Asteroids, Comets, and Dwarf Planets: Their Nature, Orbits, and Impacts

Other Planetary Systems: the New Science of Distant Worlds

Our Star

Surveying the Stars

Star Stuff

The Bizarre Stellar Graveyard

A Universe of Galaxies

The Birth of the Universe

Dark Matter, Dark Energy, and the Fate of the Universe

Life in the Universe

Filters

Exam 15: Our Galaxy

What do we mean by a protogalactic cloud?

Which of the following observations confirms that Sgr A at the center of our galaxy is indeed a supermassive black hole?

If you were to take a voyage through the entire disk of the Milky Way, what kind of material would you spend most of your time in?

What is a shock wave?

A Modern View of the Universe

Discovering the Universe for Yourself

The Science of Astronomy

Making Sense of the Universe: Understanding Motion, Energy, and Gravity

Light: the Cosmic Messenger

Formation of the Solar System

Earth and the Terrestrial Worlds

Jovian Planet System

Asteroids, Comets, and Dwarf Planets: Their Nature, Orbits, and Impacts

Other Planetary Systems: the New Science of Distant Worlds

Our Star

Surveying the Stars

Star Stuff

The Bizarre Stellar Graveyard

A Universe of Galaxies

The Birth of the Universe

Dark Matter, Dark Energy, and the Fate of the Universe

Life in the Universe

Filters