One of the most fascinating discoveries in cosmology is that the universe is constantly expanding. This idea, first proposed by Edwin Hubble in the 1920s, is supported by the observation that galaxies are moving away from us. The further a galaxy is from Earth, the faster it appears to be receding, a phenomenon known as Hubble's Law. This expansion suggests that the universe has been growing since the Big Bang, around 13.8 billion years ago. The idea of an expanding universe challenges our understanding of space and time and raises profound questions about the nature of the cosmos and its ultimate fate.
Dark Energy The Mysterious Force Driving Expansion
Recent studies have revealed that the expansion of the universe is actually accelerating, a discovery that has been linked to a mysterious force called dark energy. Dark energy is thought to make up about 68% of the universe's total energy content, but little is known about it. Scientists believe dark energy is pushing galaxies apart at an increasing rate, defying gravity’s pull. This accelerated expansion challenges current theories and has led to new research in cosmology, as scientists work to understand the true nature of dark energy and its implications for the future of the universe. Shutdown123