What is hubbles law, and how does it relate to red shift?

Hubble's Law is the observation in physical cosmology that galaxies are moving away from the Earth at speeds proportional to their distance.

Explanation:

In physics, a redshift is an increase in the wavelength and a corresponding decrease in the frequency and photon energy of electromagnetic radiation (e.g., light). The velocity of the galaxies has been determined by their redshift, a shift of the light they emit toward the red end of the spectrum. Hubble compared the distances to galaxies to their redshift and found a linear relationship. He interpreted the redshift as being caused by the receding velocity of the galaxies.

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.