The Parker Solar Probe is plunging into our star's outer atmosphere, experiencing brutal temperatures and extreme radiation.
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It was out of communication for several days during the fiery flight, and scientists were waiting for a signal, expected on December 27, to see if it had survived.
The hope is that the probe can help us better understand how the Sun works.
Probe makes historic pass through Sun's atmosphere
NASA embarks on mission to Sun
Dr Nicola Fox, NASA's chief scientist, told BBC News: "For centuries, people have studied the Sun, but you don't really experience the atmosphere of a place until you see it. You haven't visited it.
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"And so we can't really experience the atmosphere of our star unless we pass through it."
NASA's image of the Sun from NASA's Solar Dynamics Observatory NASA
The spacecraft will fly into the Sun's outer atmosphere
The Parker Solar Probe was launched in 2018, heading towards the centre of our solar system. It has already passed the Sun 21 times, getting ever closer, but its Christmas Eve visit breaks records.
At its closest, the probe is 6.2 million kilometers from the surface of our star.
That doesn't seem close, but NASA's Nicola Fox puts things into perspective: "We're 150 million kilometers from the Sun, so if you put the Sun and Earth one meter apart, the Parker Solar Probe is four centimeters from the Sun – so it's closed."
The probe will have to withstand temperatures of 1400°C and radiation that could damage the electronics on board.
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It's protected by a 11.5cm-thick carbon composite shield, but the craft's tactic is to get in and out quickly.
In fact, it's travelling faster than any man-made object, at 430,000mph, the equivalent of flying from London to New York in under 30 seconds. PA Media Aurora Borealis in Howick, Northumberland PA Media
Dazzling cosmic phenomena on Earth are caused by the solar wind
So why go to all this trouble to 'touch' the Sun?
Scientists hope that by passing through our star's outer atmosphere - its corona - the spacecraft will solve a long-standing mystery.
"The corona is really, really hot, and we have no idea why," says Dr Jenifer Millard, an astronomer at Fifth Star Laboratories in Wales.
"The surface of the sun is about 6,000°C, but the corona, that thin outer atmosphere you can see during solar eclipses, is millions of degrees - and that's further away from the sun. So how does this atmosphere get hotter?"
The mission is also expected to help scientists better understand the solar wind - the constant stream of charged particles that burst out of the corona. When these particles interact with Earth's magnetic field, the sky lights up in dazzling auroras.
But so-called space weather can also cause problems, disrupting power grids, electronics and communication systems.
"Understanding the Sun, its activity, space weather, the solar wind, is so important to our daily lives on Earth," says Dr. Millard.
NASA image of a solar flare from NASA's Solar Dynamics Observatory
Scientists hope the probe will help us solve some solar mysteries
NASA scientists will have to wait anxiously over the Christmas period while the spacecraft is out of contact with Earth.
Nicola Fox says that once a signal is transmitted home, the team will send them a green heart to let them know that the probe is in order. She admits she's nervous about the valiant effort, but she has faith in the investigation.
"I have to worry about the spacecraft. But we really designed it to withstand all these brutal conditions. It's a very, very durable spacecraft."
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