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Astronomy

The History and Future of the Sun's Lifecycle

Quick fact

The Sun has enough hydrogen fuel to keep shining for about 5 billion more years, but it has already burned through half of its core hydrogen.

Why this is interesting

The Sun you see today is middle-aged—halfway through its life. In about 5 billion years, it will swell into a red giant so large that it may engulf Mercury and Venus. What will happen to Earth?