The flash spectrum confirms a/an:

Which of the following represents the correct order of the evolution of the universe?

If the axis of rotation of the earth were extended into space,then it would pass close to

Assuming that the dimmest visible star to the naked eye has a magnitude of about $6$. The brightness of planet Venus (magnitude = $-4$) with respect to this star is ........ times brighter.

What are inferior planets,and what is meant by the elongation of a planet?

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 ...... $s$.