The percentage of dark matter has shrunk in scientists' estimates since the 1980s.
The percentage of dark energy has shrunk in scientists' estimates.
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 ordinary matter has grown in scientists' estimates.
The percentage of ordinary matter has grown in scientists' estimates.
The percentage of dark energy has shrunk in scientists' estimates.
The percentage of dark energy has shrunk in scientists' estimates.
The percentage of unknown material has grown in scientists' estimates since the 1970s.
5 answers
Which is evidence for the existence of dark energy?(1 point)
Responses
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.
Galaxies that are rotating at a constant rate.
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.
Responses
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.
Galaxies that are rotating at a constant rate.
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.
Supernovae that are moving away at an accelerating rate.
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 became part of black holes.
It became part of black holes.
It seeded the development of quasars.
It seeded the development of quasars.
It seeded the development of galaxies.
Responses
It cooled pockets of gas to form nebulae.
It cooled pockets of gas to form nebulae.
It became part of black holes.
It became part of black holes.
It seeded the development of quasars.
It seeded the development of quasars.
It seeded the development of galaxies.
It seeded the development of galaxies.
5 answers