Which of the following is an accurate description of cosmic microwave background (CMB) radiation? (1 point)
Responses
CMB is remnant radiation from the Big Bang.
CMB is remnant radiation from the Big Bang.
CMB is constantly generated by stars.
CMB is constantly generated by stars.
CMB increases across the universe.
CMB increases across the universe.
CMB produces differing temperatures across the universe
CMB produces differing temperatures across the universe
Multi-choice
Apologies for the confusion. The accurate description of cosmic microwave background (CMB) radiation is:
- CMB is remnant radiation from the Big Bang.
Which event triggers the start of black hole formation?(1 point)
Responses
A supernova blows a massive star apart.
A supernova blows a massive star apart.
A massive star depletes its stores of hydrogen and helium.
A massive star depletes its stores of hydrogen and helium.
Radiation emitted by a massive star increases.
Radiation emitted by a massive star increases.
The gravitational forces acting on a massive star decline rapidly.
A supernova blows a massive star apart.
Galaxies can be grouped by the age of the stars they tend to contain, with (elliptical / spiral / irregular) galaxies having the youngest stars and (elliptical / spiral / irregular) galaxies having the oldest stars.
Elliptical galaxies tend to have the oldest stars, while irregular galaxies tend to have the youngest stars.
Which of these describes a nebula?(1 point)
Responses
cloud of gravity and pressure
cloud of gravity and pressure
star close in size to the sun
star close in size to the sun
cloud of gas and dust
cloud of gas and dust
star much larger than the sun
A nebula is described as a cloud of gas and dust.
The universe's galaxies have evolved since what point in time?(1 point)
Responses
800 million years ago, when gas concentrations were optimal for galaxy formation
800 million years ago, when gas concentrations were optimal for galaxy formation
13.8 billion years ago, right after the universe first formed
13.8 billion years ago, right after the universe first formed
approximately 50 million years ago, after initial clumps of material were formed
approximately 50 million years ago, after initial clumps of material were formed
23.4 billion years ago, when the universe first formed