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NASA's Parker Solar Probe will reach its closest-ever point to the sun on Christmas Eve

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NASA 's Parker Solar Probe will come within 3.8 million miles ( 6.1 million km ) of the sun on Christmas Eve .

The probe will reach a top speed of 435,000 mph ( 700,000 km /h) on Tuesday .

It will also become the fastest human-made object when it zooms past our home star.

The spacecraft was launched in 2018 with the goal of learning more about the sun's atmosphere.