Discussion
The most important evidence that the universe is expanding is produced by :
Answer: D
The key evidence comes from the Doppler effect, the red shift of distant galaxies.
Light from almost all distant galaxies is shifted towards longer (redder) wavelengths, showing that they are moving away from us. In 1929 Edwin Hubble found that the recession speed is proportional to distance (Hubble's law), which is exactly what a uniformly expanding universe produces.
Supernova explosions were later used as standard candles to show that the expansion is accelerating, but the primary evidence for expansion is the red shift. Black holes and galactic collapse say nothing about the expansion of the universe.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development