The universe is about….. Billion year old

Why is radium still found in nature? Its half-life is 1600 years, and the estimated age of the universe is five billion years.

Universe originated about 15 billion year ago by

Age of the universe is about 10^(10) years whereas the mankind has existed for 10^6 years. How many seconds would the man have existed if age of universe were one day.

The age of the universe is about 10^17 years whereas the mankind has existed for 10^9 years. For how many seconds would the man have existed if the age of universe were 1 day ?

The age of the universe is about 10^17 years whereas the mankind has existed for 10^9 years. For how many seconds would the man have existed if the age of universe were 1 day ?

The universe is very old almost

The universe is very old almost

In the solar system of the milky way galaxy, earth was supposed to have been formed about…… billion years back

In the solar system of the milky way galaxy, earth was supposed to have been formed about…… billion years back