The age of the universe is believed to be

According to the pulsating theory,the expansion and contraction of the universe repeats after every

Which of the following is not true about the total lunar eclipse?

If the average life of a person is taken as $100 \, s$,the age of the universe on this scale is of the order of ...... $s$.

The farthest objects in our Universe discovered by modern astronomers are so distant that light emitted by them takes billions of years to reach the Earth. These objects (known as quasars) have many puzzling features,which have not yet been satisfactorily explained. What is the distance in $km$ of a quasar from which light takes $3.0$ billion years to reach us?

Albedo is maximum for