La sonde Parker de la Nasa approche du Soleil en 2024

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Lancée en 2018, la sonde Parker s'approche chaque année un peu plus près du soleil. - L'info en continu  https://buzzplus.fr/ Infos, news & actualités - L'information internationale en direct.

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00:00 Launched in 2018, the Parker probe approaches the Sun a little closer each year.

00:05 By 2024, it should beat its own record by trailing another star at a distance of only 6.1 million km.

00:13 The goal is to learn more and more about the solar crown and wind,

00:17 this energy flow of particles that bathes the entire solar system.

00:21 This is one of the most fascinating missions in the history of space exploration.

00:25 Parker Solar Probe, the first mission to penetrate the solar atmosphere, should know its peak in a year,

00:31 at the end of December 2024, approaching the Sun, only 6.1 million km away.

00:38 Another feat, Parker will travel at an incredible speed of 700,000 km / h,

00:42 the equivalent of a New York-Tokyo trip in a minute, which will make it the fastest object in history.

00:48 This is a monumental achievement for all of humanity.

00:53 It is the equivalent of the 1969 landing, assured by the scientific boobie,

00:58 Nour Rawafi, of the physics laboratory applied by the Johns Hopkins University of Baltimore, in the United States.

01:04 The NASA probe will thus beat its own record, established this year with a passage

01:09 at 7.26 million km from the Sun at a speed of 635,000 km / h.

01:14 To reach such a speed, Parker uses Venus' gravitational assistance,

01:19 a technique that uses the attraction of a planet to offer additional speed to a spacecraft.

01:25 Temperatures approaching 1,400 ° C.

01:29 Launched in 2018, Parker Solar Probe aims to make 24 trips through the part of the atmosphere of the Sun

01:35 that scientists call the "Key Crown", paradoxically, is 300 times hotter than the surface of the star.

01:42 To be at the first stop of the solar show, the spacecraft faces unimaginable conditions,

01:47 temperatures approaching 1,400 ° C and solar winds loaded with high-energy particles.

01:53 To escape this hell, Parker uses its speed as well as a carbon thermal shield

01:58 composed of a dozen centimeters thick that protects scientific instruments.

02:03 A shield whose construction was only made possible recently thanks to the progress of technology.

02:08 At each passage, the embarked tools measure high-energy particles,

02:13 magnetic fluctuations take images but also sound.

02:17 In 2020, recordings made near the Sun were the first to offer a sound representation of solar winds.

02:24 The mysteries of the solar crown.

02:27 For scientists, the goal is to better understand the functioning of solar activity,

02:32 and in particular the mysteries surrounding the crown,

02:35 whose temperature can reach 1 million ° C, against only 6,000 ° C at the surface of the Sun.

02:41 How to explain that the heat rises far from the core of the star?

02:45 It is also this region of the solar atmosphere that is at the origin of the solar wind,

02:49 this flow of high-energy particles loaded with ions and electrons

02:52 that constantly escapes from the Sun and bathes the entire solar system.

02:56 The hope of scientists is to understand the formation of the phenomenon

03:00 and predict solar eruptions, these spasms that can disrupt the Earth's magnetic field,

03:04 radio communications and satellites, or even harm the health of astronauts.

03:09 In the long run, the goal would be to set up a solar weather

03:12 to anticipate the arrival of these flows of particles.

03:15 The flight of December 2024 will represent the ultimate chance for scientists

03:19 to get closer to the mysteries of the solar star.

03:23 After that, the Parker probe will no longer be able to repeat the feat

03:27 because its orbit will no longer allow it to use Venus to rectify its trajectory.

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