Where is the Andromeda Galaxy?

The Andromeda Galaxy, also called M31, is a spiral galaxy roughly 2.5 million light-years from Earth. On a dark, clear night it can be seen with the naked eye as a faint smudge, making it the most distant object most people can see without a telescope. It is about 220,000 light-years across and contains around one trillion stars, more than the Milky Way. Andromeda is moving towards us at about 110 kilometres per second. Astronomers once predicted a certain collision in around 4.5 billion years, but a 2025 study suggested the chance of a merger within 10 billion years is closer to 50 percent.