Which is evidence for the existence of dark energy?(1 point)
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.
Galaxies that are rotating at a constant rate.
Galaxies that are rotating at a constant rate.
Black holes that are expanding at a constant rate.
Black holes that are expanding at a constant rate.
5 answers
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 seeded the development of galaxies.
It seeded the development of galaxies.
It cooled pockets of gas to form nebulae.
It cooled pockets of gas to form nebulae.
It seeded the development of quasars.
It seeded the development of quasars.
It became part of black holes.
Responses
It seeded the development of galaxies.
It seeded the development of galaxies.
It cooled pockets of gas to form nebulae.
It cooled pockets of gas to form nebulae.
It seeded the development of quasars.
It seeded the development of quasars.
It became part of black holes.
It seeded the development of galaxies.
How has scientific understanding about the composition of the universe changed over time? Select the two correct answers.(1 point)
Responses
The percentage of ordinary matter has grown in scientists' estimates since the 1970s.
The percentage of ordinary matter has grown in scientists' estimates since the 1970s.
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 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 dark energy has shrunk in scientists' estimates since the 1980s.
The percentage of dark energy has shrunk in scientists' estimates since the 1980s.
Responses
The percentage of ordinary matter has grown in scientists' estimates since the 1970s.
The percentage of ordinary matter has grown in scientists' estimates since the 1970s.
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 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 dark energy has shrunk in scientists' estimates since the 1980s.
The percentage of dark energy has shrunk in scientists' estimates since the 1980s.
The percentage of ordinary matter has grown in scientists' estimates since the 1970s and The percentage of unknown material has grown in scientists' estimates since the 1970s.