The galaxy in which we live is:

The Milky Way is:

“The universe is expanding” means

$A$ particular emission line,detected in the light from a galaxy,has a wavelength $\lambda' = 1.1\lambda$,where $\lambda$ is the proper wavelength of the line. The distance of the galaxy from us is:

If a galaxy is at a distance of $430$ million light years from us,what is the Hubble's constant in $km s^{-1}$ per million light years? Its speed is $6.48 \times 10^6 m s^{-1}$.

The image shows a diagram of the solar system. Which of the following planets is known as the 'Red Planet'?