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The solar mass is a standard unit of mass in astronomy equal to the mass of the Sun, which is approximately $1.989 \times 10^{30}$ kilograms.

The Hubble Constant is the rate of expansion of the universe. Current measurements estimate it to be about 70 kilometers per second per megaparsec ($70 \, \text{km/s/Mpc}$).

Redshift is a dimensionless quantity that indicates the relative change in the wavelength of light due to the expansion of the universe or the Doppler effect. It is used to determine the distance to faraway galaxies.

A light year is the distance that light travels in one year in a vacuum. It measures about 9.461 trillion kilometers.

The solar radius is a unit of distance used to express the size of stars in astronomy. It is equivalent to the radius of the Sun, about 695,700 kilometers.

A Jansky is a unit of spectral flux density or specific intensity traditionally used by astronomers. It is equal to $10^{-26}$ watts per square meter per hertz.

A parsec is the distance at which one astronomical unit subtends an angle of one arcsecond. 1 parsec ≈ 3.26 light years ∼ 30.86 trillion kilometers.

The solar luminosity is a unit of power used to express the luminous efficacy of stars. It is equal to the luminosity of the Sun, which is about $3.828 \times 10^{26}$ watts.

An astronomical unit is approximately the mean distance between the Earth and the Sun. It is about 149.6 million kilometers.