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WorksheetsITTE 1.2
Total questions: 10
Worksheet time: 5mins
The Universe has a center and an edge where expansion begins.
True
False
Why do galaxies not expand even though the Universe does?
Because their gravity holds them together
Because of dark energy
Because they rotate too fast
Because they are at the Universe’s center
Which evidence first showed that the Universe’s expansion is accelerating?
Discovery of cosmic rays
Observation of distant supernovae
Measurement of Earth’s gravity
Observation of meteor impacts
What role did cosmic inflation play in the Universe’s development?
Slowed down the formation of stars
Expanded the Universe faster than light, smoothing irregularities
Created black holes
Formed dark matter
What element was NOT produced during Big Bang nucleosynthesis?
Helium
Hydrogen
Carbon
Lithium
The cosmic microwave background radiation formed about 380,000 years after the Big Bang.
True
False
Why can astronomers still detect the cosmic microwave background (CMB) today?
It is the leftover radiation from when the Universe first became transparent
It comes from newly formed stars
It is reflected sunlight
It was emitted by black holes
During the “Dark Ages,” what was the main component of the Universe?
Heavy metals
Hydrogen and helium gas
Dark energy
Stars and galaxies
What caused the Universe to become transparent again after the Dark Ages?
Cooling of the gas
Light from first stars ionized hydrogen atoms
Explosion of black holes
Expansion stopped
The strong nuclear force is weaker than gravity but acts over a longer range.
True
False
