Asteroids are

The image shows a diagram of the solar system. Which of the following correctly identifies the planets in the order of their distance from the Sun?

The galaxies are moving away from each other. This phenomenon is explained by:

The death of a star results in a neutron star if the original mass of the star in terms of the mass of the Sun $(M)$ is:

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 ...... $s$.

Who was the first Indian astronaut to travel into space?