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 red shift phenomenon in space 3. Movement of asteroids in space 4. Occurrence of su

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Q: 44 (IAS/2012)
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 red shift 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 :

question_subject: 

Geography

question_exam: 

IAS

stats: 

0,43,133,43,46,56,31

keywords: 

{'continued expansion': [0, 0, 0, 1], 'evidences': [0, 0, 0, 2], 'supernova explosions': [0, 0, 0, 1], 'evidence': [0, 0, 0, 5], 'universe': [0, 0, 0, 1], 'observation': [0, 0, 0, 5], 'occurrence': [1, 0, 2, 5], 'red shift phenomenon': [0, 0, 0, 1], 'space': [4, 1, 7, 12], 'microwaves': [0, 0, 4, 9], 'scientists': [2, 2, 8, 11]}

The correct answer is 1 and 2.

Explanation:

1. The detection of microwaves in space is evidence for the continued expansion of the universe. In the 1960s, scientists discovered a faint glow of microwave radiation that permeates the universe, which is called the cosmic microwave background (CMB). This radiation is thought to be the afterglow of the Big Bang, and its properties provide strong evidence for the continued expansion of the universe.

2. The observation of the redshift phenomenon is also evidence for the continued expansion of the universe. When astronomers observe light from distant galaxies, they find that the light is shifted towards the red end of the spectrum. This is because the galaxies are moving away from us, and the light is stretched out as it travels through expanding space.

3. The movement of asteroids in space is not related to the continued expansion of the universe, so this statement is incorrect.

4. The occurrence of supernova explosions in space is indirectly related to the continued expansion of the universe. The brightness and properties of supernovae can be used to measure the distances to their host galaxies, which in turn can be used to study the expansion of the universe.

Therefore, the correct statements are 1 and 2.