NASA’s Parker Solar Probe is set for its second close encounter with the sun, flying within 3.8 million miles of its surface.

The spacecraft, which holds the record for the closest approach to the sun, will reach speeds of 430,000 mph.

Launched in 2018, Parker has already flown through the sun’s corona, and scientists hope its data will help explain why the sun’s outer atmosphere is much hotter than its surface and what drives the solar wind, ABC News has reported.

The probe’s team won’t hear back from it until Tuesday afternoon due to the flyby occurring out of communication range.

Written by B.C. Begley