Time Dilation in Early Universe
Context: Scientists observed a ferocious class of black holes called quasars that demonstrate “time dilation” in the early universe, showing how time then passed only about a fifth as quickly as it does today. About Quasars:
News Source: The Hindu
- Quasars are extremely active supermassive black holes found at the centers of galaxies.
- They are millions to billions of times more massive than our sun.
- These black holes draw in matter with their strong gravitational pull and emit intense radiation, including high-energy particle jets.
- They are surrounded by a glowing disk of matter.
- Quasars’ brightness allows scientists to study the early stages of the universe, as they can be observed from great distances.
- In their study, scientists looked at 190 very bright objects in space called quasars.
- These quasars were from a time about 1.5 billion years after the Big Bang, which created the universe.
- The scientists compared the brightness of these ancient quasars to the brightness of quasars we see today.
- They found that certain changes that happen in quasars today happened five times slower in the ancient ones.
- This tells us that time used to pass more slowly in the early universe compared to now.
About Black Hole: