00:00Imagine the faint white band we see across the night sky.
00:07We actually have our own celestial home.
00:09This is called the Milky Way or the Milky Way.
00:13This is the vast galaxy that contains our Sun, Earth, and the entire solar system.
00:21According to estimates, there are approximately one hundred to four hundred billion stars in this galaxy.
00:27It is not yet possible to accurately count all the stars.
00:30But it is certain that our Sun is just one of those similar stars.
00:34The diameter of our galaxy is approximately 100,000 light years.
00:39This means that if light, which travels at a speed of about three lakh kilometres per second
00:45Travel non-stop from one side of the galaxy to the other
00:49Even then it will take him about one lakh years to cover this distance.
00:53Now the most interesting thing
00:55Our Sun is not at the very center of the Milky Way
00:58It is located in a small spiral branch called Orion's Purus, about 26,000 light-years from the center.
01:05This means that if any light is emitted from the center of the Milky Way today
01:11So it will take about 26,000 years to reach Earth.
01:15Just imagine
01:17The galaxy in which our entire solar system is contained
01:21We are not at the center of that either.
01:23And what is even more surprising is this
01:25that there isn't just one like us in the universe
01:28Rather, billions of galaxies exist.
01:30That means our solar system is a small part of that one galaxy.
01:36and our galaxy
01:37The self is only one of the countless vast worlds of the universe
