An Astronomical unit (AU) is defined as the average distance between the
Sun and the Earth

Mercury can be said to be about 1/3 of an AU from the Sun and Pluto averages about 40 AU from the Sun

The average distance from the Sun to the Earth is approximately 93 million miles

It takes approximately 8 minutes for light from the Sun to reach the Earth

Light moves at a velocity of approximately 186 411.357 67 miles each second

A light year is the distance that light can travel in one year

One light year is equal to 5 903 026 326 300 miles

Astronomers use units of a light year to calculate distances from outside of
our solar system

The Milky Way Galaxy is approximately 150,000 light-years across

The distance to the next nearest star, Proxima Centauri from Earth is
24 854 847 689 000 miles

The distance to Proxima Centauri is 4.24 light years

The distance to our nearest galaxy, the Andromeda Galaxy is
13 048 795 037 000 000 000 miles

The Andromeda Galaxy is 2.3 million light-years away

Einstein's equation,  E = mc² is the equation of mass-energy equivalence where E is energy, m is mass, and c is the speed of light in a vacuum

The Math of General Relativity is: (curvature of space-time) = (mass-energy density) * 8 pi G / c4

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