Astronomical unit:

1 AU = 1.496 × 10¹¹ m

Light-year:

1 ly = 9.461 × 10¹⁵ m

       = 63,240 AU

Parsec:

1 pc = 3.086 × 10¹⁶ m

        = 3.262 ly

Solar mass:

1 M_⊙ = 1.989 × 10³⁰ kg

Solar radius:

1 R_⊙ = 6.960 × 10⁸ m

Solar luminosity:

1 L_⊙ = 3.827 × 10²⁶ W

Earth’s mass:

1 M_⊕ = 5.974 × 10²⁴ kg

Earth’s equatorial radius:

1 R_⊕ = 6.378 × 10⁶ m

Moon’s mass:

1 M_Moon = 7.349 × 10²² kg

Moon’s equatorial radius:

1 R_Moon = 1.738 × 10⁶ m