For decades, scientists have known that our universe is not static; it’s expanding, like a colossal balloon inflating with galaxies drifting further apart.
But in the late 1990s, a groundbreaking discovery revealed something astonishing: this expansion isn’t slowing down due to gravity, as expected; it’s actually accelerating, pushing galaxies apart faster and faster.
So, what’s the cosmic engine driving this speed-up? The leading explanation is a mysterious, invisible substance called dark energy, thought to make up about 68% to 70% of the universe’s total energy and matter, though its true nature remains one of science’s greatest enigmas.
Why this relentless acceleration? This fundamental question drives much of today’s cosmological research, with scientists using advanced observatories to measure the universe’s expansion with unprecedented precision, hoping to unlock the secrets of dark energy and determine our universe’s ultimate destiny.