WASHINGTON, D.C. — NASA's pioneering Parker Solar Probe is poised to make its closest-ever approach of the Sun on Christmas Eve, a record-setting 3.8 million miles (6.2 million kilometers) from the surface.

Launched in August 2018, the spaceship is on a seven-year mission to deepen scientific understanding of our star and help forecast space-weather events that can affect life on Earth.

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