primordial light from the stars tonight

most stars are part of a large group of millions of stars, called galaxies. The sun, the earth, and the other planets in the solar system is called the Milky Way. only three other galaxies outside the Milky Way is visible from Earth without a telescope. all three can be seen only at night and the shape of the bright spots of light that escaped in lagit. north of the equator, the only one visible galaxy called the Andromeda Galaxy

The stars in the galaxy very far away from the earth until its light takes two million years until the earth. the light was already starting a long journey before humans inhabited the earth. if one of the stars of the Andromeda galaxy suddenly exploded to smithereens, human beings on earth can only know two million years later.

and do you know how much distance the Andromeda galaxy to earth?
if the distance is calculated in units of kilometers, the number is so huge that is almost 20.000.000.000.000.000.000 (twenty kuintiliun) kilometers