Which of the following is/are cited by the scientists as evidence/evidences for the continued expansion of uni

Question

Which of the following is/are cited by the scientists as evidence/evidences for the continued expansion of universe?
1. Detection of microwaves in space
2. Observation of redshift phenomenon in space
3. Movement of asteroids in space
4. Occurrence of supernova explosions in space
Select the correct answer using the codes given below:

Accepted Answer

The correct answer is A because both the detection of microwaves and the observation of redshift are foundational proofs for the expansion of the universe.

1. Detection of microwaves in space: This refers to the Cosmic Microwave Background Radiation. It is considered the afterglow of the Big Bang. Its uniform presence across the universe suggests that space has expanded from a very hot, dense initial state.

2. Observation of redshift phenomenon: When galaxies move away from us, the light they emit shifts toward the longer, redder wavelengths of the spectrum. This observation, known as Hubbles Law, directly indicates that galaxies are receding from each other as the universe expands.

The movement of asteroids is a local phenomenon within solar systems governed by gravity and does not indicate the expansion of the universe. Similarly, while supernova explosions are events used as standard candles to measure distances and the rate of expansion, the explosions themselves are not evidence of expansion. Therefore, only statements 1 and 2 serve as primary evidence.

Answer

1 and 2

Answer

2 only

Answer

1, 3 and 4

Answer

None of the above can be cited as evidence

Explanation

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