Complete these sentences by matching the phrases below.

1. Scientists recreate early conditions of the universe using:
2. The heat left over from the beginning of the universe is:
3. The prevailing idea about the beginning of the universe is called:
4. The speed of stars can be measured using:

1. The Doppler effect
2. Cosmic microwave background radiation
3. Particle accelerators
4. The Big Bang theory

Scientists recreate early conditions of the universe using the Doppler effect. The heat left over from the beginning of the universe is cosmic microwave background radiation. The prevailing idea about the beginning of the universe is called the Big Bang theory, and The speed of stars can be measured using particle accelerators.

What is Doppler effect?

The noticeable difference seen between frequency at which sound or light waves escape an origin and that at which they attain an observer induced by relative motion of the observer and the wave citation is known as the Doppler effect.

The given sentence can be matched as:

The Doppler effect is used by scientists to recreate the early conditions of the universe.
Cosmic microwave background radiation is the heat left over from the beginning of the universe.
The Big Bang theory is the dominant idea about the beginning of the universe.
The speed of stars can be measured using particle accelerators.

Thus, above-mentioned is the match for the given phrases.

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