Key Points
Key Points: The Universe
- The universe is an ever-expanding expanse encompassing all matter, energy, time, and celestial bodies.
- It is primarily structured by billions of galaxies, which are massive, gravitationally bound collections of stars and planetary systems.
- Our solar system is located within the Milky Way, which forms part of the Local Group of galaxies alongside its closest major neighbour, the Andromeda galaxy.
- Scientific consensus suggests the universe originated from a massive explosion known as the Big Bang approximately 13.7 to 15 billion years ago.
- Earth was formed around 4.5 billion years ago from a collapsing gaseous cloud, with the first life emerging roughly 500 million years later.
