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The solar radius is used to express the size of stars. It is based on the radius of the Sun, which is about 696,340 kilometers.

1 parsec is equivalent to approximately 3.086 trillion kilometers.

The Hubble parameter is the rate of expansion of the universe, used to determine distances to galaxies, typically measured in kilometers per second per megaparsec (km/s/Mpc).

1 Ångstrom is equivalent to $10^{-10}$ meters or 0.0000000001 kilometers.

The Planck length is a theoretical minimum length in the universe, approximately $1.616 \times 10^{-35}$ meters or $1.616 \times 10^{-38}$ kilometers.

Redshift is a dimensionless quantity that indicates the increase in wavelength, used to determine distances to faraway galaxies.

1 megaparsec is equivalent to one million parsecs or about 3.086 x 10^19 kilometers.

1 kiloparsec is equivalent to 1,000 parsecs or about 3.086 trillion kilometers.

1 AU is equivalent to approximately 149.6 million kilometers.