Cosmological Time Scale and Radius of Observable Universe Flashcards
When did the Big Bang occur?
13.7 billion years ago.
When did Planets start to form?
About 5 billion years ago.
When did Jesus exist?
2,000 years ago.
How long do most Humans live?
Between 30 and 100 years.
Why is it important to put the universe’s age and size into perspective?
It helps us to realize how massive and old the universe truly is.
How does the Radius of the Observable Universe change?
It constantly grows in size.
Why do we see the night sky as it was a long time ago?
It takes a very long time for the light to travel from these distant places, so we see the “old” light in the sky.
How “old” is the light from the edge of the currently Observable Universe?
The light is from 13.7 billion years ago.
Why can’t you state the exact time that it took for light to travel somewhere?
The universe expands, making the distance increasingly longer.
