MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
The Sun as a red giant, illustration. Earth begins to melt as the red-giant Sun swells and approaches our planet's orbit. Eventually the melting may penetrate throughout Earth's crust, leaving the planet molten from surface to core. The fate of the Earth is unclear. It may become engulfed by the Sun, or it may move to a safe orbit as the Sun sheds mass at the end of its life.
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