Which of the following is /are cited by the scientists as evidence/evidences for the continued expansion of the universe? 1. Detection of microwaves in space 2. Observation of the redshift phenomenon in space 3. Movement of asteroids in space 4. The occurrence of supernova explosions in space

QUESTION

Hard

Science & Technology

Prelims 2012

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

Detection of microwaves in space
Observation of the redshift phenomenon in space
Movement of asteroids in space
The occurrence of supernova explosions in space

Select an option to attempt

Explanation

Statement 1 is correct: The cosmic microwave background radiation is relic radiation from the early universe and provides strong evidence supporting an expanding universe.

Statement 2 is correct: Redshift of light from distant galaxies indicates that they are moving away from each other, directly evidencing the expansion of the universe (Hubble’s Law).

Statement 3 is incorrect: Movement of asteroids is governed by local gravitational dynamics within solar systems and has no relevance to the large-scale expansion of the universe.

Statement 4 is correct: Type Ia supernova observations are used as standard candles to measure cosmic distances and have provided evidence for the expansion (and accelerated expansion) of the universe.

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