The Sun is expected to last another 5 billion years before it becomes unstable and transforms into a red giant. (Image credit: alexandarilich/Getty Images)
Our solar system has been around for 4.6 billion years. While that seems like a long time, it's only a small part of the universe's 13.8 billion-year history. And at some point, the solar system will cease to exist.
But when exactly will the solar system cease to exist? And how exactly will this happen?
The answers to these questions depend on how we define the end of the solar system.
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