this post was submitted on 30 Dec 2023
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109
Nasa mission lines up to 'touch the Sun' (www.bbc.com)
submitted 10 months ago by Stamau123@lemmy.world to c/news@lemmy.world
14 comments fedilink hide all child comments
 

It promises to be a remarkable moment in the history of space exploration.

A year from now, on 24 December, Nasa's Parker Solar Probe will race past the Sun at the astonishing speed of 195 km/s, or 435,000 mph.

No human-made object will have moved so fast nor, indeed, got so close to our star - just 6.1 million km, or 3.8 million miles from the Sun's "surface".

"We are basically almost landing on a star," said Parker project scientist Dr Nour Raouafi.

"This will be a monumental achievement for all humanity. This is equivalent to the Moon landing of 1969," the Johns Hopkins University Applied Physics Laboratory scientist told BBC News.

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[–] themeatbridge@lemmy.world 17 points 10 months ago (8 children)

I am not a smart man, but 6.1 million km seems like really far away from something.

[–] LogicalDrivel@sopuli.xyz 0 points 10 months ago

I was curious so I asked GPT. Pretty interesting stuff

The solar corona is the outermost layer of the Sun's atmosphere. Its outer boundary is not well-defined, and its extent varies depending on solar activity. However, on average, the solar corona extends several solar radii above the Sun's surface. One solar radius is approximately 696,340 kilometers.

During a total solar eclipse, when the Moon completely blocks the Sun, the outer parts of the solar corona become visible to observers on Earth. At that time, the corona can be seen extending far beyond the Sun's visible disk. The temperature of the solar corona is much higher than the temperature of the Sun's surface, and the reason for this temperature difference is still a topic of scientific research.

While the solar corona is not a fixed distance from the Sun's surface, it typically extends millions of kilometers into space. The exact dimensions can vary depending on solar activity, such as the solar cycle and the presence of solar flares or coronal mass ejections.

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