Lesson 6 Multiple Choice Flashcards
(19 cards)
What are types of geometry for the universe?
Closed, open, or flat
Two elements that make up 99% of the normal matter generated by the Big Bang are
Hydrogen and helium
According to Hubble’s Law, if galaxy A is 10 times more distant than galaxy B, then galaxy A is (receding, approaching)…
receding 10 times faster than B
If you think that the Hubble Constant is 100km/s/Mpc. and someone else says it is 50km/sec/Mpc that means their idea of the universe is (older or younger?)
Twice as old as yours
What is untrue about primordial background radiation?
It disproves the Big Bang
What is NOT a problem with simple models of galaxy formation?
The origin of disturbances that form galaxies
The existence of the cosmic background radiation implies what?
That the universe began in a hot, dense state
The universe is how old?
13 billion years old
The sky is dark at night because…
The universe has a finite age and some of the light has not had a chance to reach us yet
Cosmologists now believe that the universe is flat because of what?
Dark energy
What percentage of the universe is luminous?
0-20%
During the Big Bang, the most massive particle or combination of particles that were made are what?
a lithium nucleus
Radio telescopes designed to detect millimeter-wavelength radiation above the atmosphere to measure cosmic background radiation would measure it how? (In what directions and how much?)
Equally from all directions in space
What is an observed property of microwave background radiation?
Its spectrum matches that for a blackbody at a temperature of 2.7 K
What is NOT a basic assumption of modern cosmology?
The universe is infinite in extent
What observation is NOT important to modern cosmology?
Everything appears to revolve around Earth
The latest observations of the most distant regions of the universe indicate that the expansion of the universe is…
speeding up
For matter to be produced directly from radiation…
the energy-mass equivalent of the particles that are formed.
Photons we see as primordial background radiation were emitted approximately when in relation to the Big Bang?
300,000 years after the Big Bang
