Venus looks brighter than other stars because

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 angle of maximum elongation for Venus is $47^\circ$. The distance of Venus from the Sun in $AU$ is .......

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?

According to modern astronomers,into how many constellations is the whole sky divided?

Describe the Ptolemaic model for planetary motion.