Here's what that means:
* km/s/Mpc: This unit means "kilometers per second per megaparsec." A megaparsec is a unit of distance roughly equal to 3.26 million light-years.
* Acceleration: The Hubble Constant tells us how fast the expansion of the Universe is increasing. Every megaparsec further away a galaxy is, the faster it is moving away from us.
Important points:
* Not a constant constant: The Hubble Constant is not truly constant. It changes over time, but its value is currently considered to be approximately 73.5 km/s/Mpc.
* Dark Energy: The acceleration of the Universe is attributed to a mysterious force called dark energy. Dark energy makes up about 68% of the total energy density of the Universe and is thought to be responsible for the accelerated expansion.
* Measurement challenges: Determining the exact value of the Hubble Constant is challenging, and different methods of measurement can lead to slightly varying results.
In simpler terms: Imagine a balloon with dots drawn on it. As you blow into the balloon, the dots move apart, and the further apart they are, the faster they move away from each other. This is analogous to the expanding Universe. The Hubble Constant tells us how fast the dots (galaxies) are moving apart.
