Which is evidence for the existence of dark energy?(1 point)

Question

Responses

Pulsars that seem to be moving closer at an accelerating rate.
Pulsars that seem to be moving closer at an accelerating rate.

Supernovae that are moving away at an accelerating rate.
Supernovae that are moving away 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.

Answer 1

The correct response is:

Supernovae that are moving away at an accelerating rate.

This observation, particularly from Type Ia supernovae, provides key evidence for the existence of dark energy, leading to the conclusion that the expansion of the universe is accelerating.

Answer 2

How did dark matter affect the development of structures in the early universe?(1 point)
Responses

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 became part of black holes.
It became part of black holes.

It seeded the development of quasars.

Answer 3

The correct response is:

It seeded the development of galaxies.

Dark matter played a crucial role in the formation of large-scale structures in the universe, providing the gravitational scaffolding necessary for gas to collapse and form galaxies.

Answer 4

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 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 dark energy has shrunk in scientists' estimates.
The percentage of dark energy has shrunk in scientists' estimates.

The percentage of ordinary matter has grown in scientists' estimates.
The percentage of ordinary matter has grown in scientists' estimates.

Answer 5

The two correct responses are:

1. The percentage of unknown material has grown in scientists' estimates since the 1970s.
2. The percentage of dark energy has shrunk in scientists' estimates.

Over time, scientists have come to realize that a significant portion of the universe's composition is made up of dark matter and dark energy, leading to updated estimates about their proportions compared to ordinary matter.