The percentage of unknown material has grown in scientists' estimates since the 1970s.
The percentage of ordinary matter has grown in scientists' estimates.
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Question
How has scientific understanding about the composition of the universe changed over time? Select the two correct answers.(1 point)
Responses
The percentage of dark energy has shrunk in scientists' estimates.
The percentage of dark energy has shrunk in scientists' estimates.
The percentage of dark matter has shrunk in scientists' estimates since the 1980s.
The percentage of dark matter has shrunk in scientists' estimates since the 1980s.
The percentage of unknown material has grown in scientists' estimates since the 1970s.
The percentage of unknown material has grown in scientists' estimates since the 1970s.
The percentage of ordinary matter has grown in scientists' estimates.
5 answers
How did dark matter affect the development of structures in the early universe?(1 point)
Responses
It became part of black holes.
It became part of black holes.
It cooled pockets of gas to form nebulae.
It cooled pockets of gas to form nebulae.
It seeded the development of galaxies.
It seeded the development of galaxies.
It seeded the development of quasars.
Responses
It became part of black holes.
It became part of black holes.
It cooled pockets of gas to form nebulae.
It cooled pockets of gas to form nebulae.
It seeded the development of galaxies.
It seeded the development of galaxies.
It seeded the development of quasars.
The correct answer is:
- It seeded the development of galaxies.
Dark matter played a crucial role in the formation and evolution of galaxies. It is believed to have provided the gravitational framework upon which ordinary matter, such as gas and dust, could accumulate and form galaxies. Dark matter's gravitational pull helped to bring together the necessary materials to initiate the process of galaxy formation. Therefore, it seeded the development of galaxies.
- It seeded the development of galaxies.
Dark matter played a crucial role in the formation and evolution of galaxies. It is believed to have provided the gravitational framework upon which ordinary matter, such as gas and dust, could accumulate and form galaxies. Dark matter's gravitational pull helped to bring together the necessary materials to initiate the process of galaxy formation. Therefore, it seeded the development of galaxies.
Which is evidence for the existence of dark energy?(1 point)
Responses
Supernovae that are moving away at an accelerating rate.
Supernovae that are moving away at an accelerating rate.
Pulsars that seem to be moving closer at an accelerating rate.
Pulsars that seem to be moving closer at an accelerating rate.
Black holes that are expanding at a constant rate.
Black holes that are expanding at a constant rate.
Galaxies that are rotating at a constant rate.
Responses
Supernovae that are moving away at an accelerating rate.
Supernovae that are moving away at an accelerating rate.
Pulsars that seem to be moving closer at an accelerating rate.
Pulsars that seem to be moving closer at an accelerating rate.
Black holes that are expanding at a constant rate.
Black holes that are expanding at a constant rate.
Galaxies that are rotating at a constant rate.
The correct answer is:
- Supernovae that are moving away at an accelerating rate.
One of the pieces of evidence for the existence of dark energy comes from observations of distant supernovae. It has been observed that these supernovae are moving away from us at an accelerating rate, implying that the expansion of the universe is speeding up. This acceleration is attributed to the presence of dark energy, which counteracts the gravitational pull and causes the expansion of the universe to accelerate. Therefore, the observation of supernovae moving away at an accelerating rate supports the existence of dark energy.
- Supernovae that are moving away at an accelerating rate.
One of the pieces of evidence for the existence of dark energy comes from observations of distant supernovae. It has been observed that these supernovae are moving away from us at an accelerating rate, implying that the expansion of the universe is speeding up. This acceleration is attributed to the presence of dark energy, which counteracts the gravitational pull and causes the expansion of the universe to accelerate. Therefore, the observation of supernovae moving away at an accelerating rate supports the existence of dark energy.
1 answer