What Do We Really Mean When We Say the Universe Is Expanding?
Hi Hello! I know it’s been a while since I wrote anything meaningful, but better late than never. Well then, “What Do We Really Mean When We Say the Universe Is Expanding?” is our question of the day and I will try to put my understandings based on various sources in simple terms. Abh Shuru se Shuruwat karte hai! A long, long time ago, around 13.8 billion years ago, the universe began to exist- as a singularity. A point of infinite density and temperature. In a fraction of a second, it expanded and cooled, allowing energy to become matter: first subatomic particles, then atoms. Gravity pulled this matter together to form stars, planets, galaxies- everything we see in the skies today. Over a period of time, the expansion slowed down but never stopped, and even today, the universe is expanding. Studies believe the “driving force” behind this big bang, and now the expansion of the universe, is a mysterious force we call dark matter—but that is another topic for another day. But ...