A National Aeronautics and Space Administration (NASA) probe has plunged* into the Sun’s atmosphere as part of a daring mission to learn more about our closest star.

The journey marks the car-sized Parker Solar Probe’s closest solar encounter* yet, coming closer to the Sun than any man-made object in history.

It began its descent* last week, and will be out of communication with Earth for several days.

Travelling within 24 million kilometres of the Sun’s surface, the probe will experience temperatures of 1300 Celcius on its trip.

During the mission, all four instruments aboard the Parker Solar Probe will be collecting data from the Sun’s outer atmosphere, or “corona”.

Any data collected will be sent back to Earth this autumn within a period of several weeks.

It marks the second of 24 planned fly-bys* for the spacecraft.

The last of these, in 2024, will see the probe make a “final descent” into the Sun where it will burn up under extreme temperatures.

It’s hoped that the $2.1 billion mission will give NASA an up-close look at how our nearest star works.


Specifically, NASA is investigating how events known as solar flares erupt from the star.

Flares can disrupt communications on Earth and in extreme cases even throw out power grids.

The probe was launched in August 2018 and travels at a top speed of 690,000km/h — faster than any spacecraft in history.

The craft is using Venus’s gravity over the course of its 150 million kilometre journey to gradually bring its orbit closer to “touch the sun”, as NASA calls it.

Of course, the spacecraft won’t actually touch the Sun — its temperature is a whopping 5500 degrees Celcius and would instantly destroy any probe.

media_cameraThe United Launch Alliance Delta IV Heavy rocket with the Parker Solar Probe on-board during its launch on August 12, 2018. Picture: AFP/ NASA / Bill Ingalls

Instead, it will fly into the sun’s atmosphere, where it will observe from a “safe distance” of approximately 6.4 million kilometres away from the star’s surface — protected by a “cutting-edge* heat shield”.

“The spacecraft will provide unprecedented* information about our Sun, where changing conditions can spread out into the solar system to affect Earth and other worlds,” explained NASA in a statement.

“It will trace how energy and heat move through the Sun’s atmosphere and explore what accelerates the solar wind and solar energetic particles*.”

VIDEO: The Sun emits powerful solar flare. Note: there is no audio on this video

This mission is part of NASA’s Living With A Star program, which aims to uncover the secrets of the relationship between the Sun and Earth.

The space agency said: “The goal is to provide the comprehensive* research needed to understand the many factors affecting the Sun-Earth system and thus provide the information necessary for improved forecasting of space weather.”

media_cameraBright bands of plasma on the Sun connecting from one active region to another, even though they are tens of thousands of miles away from each other. Picture: AFP / NASA/GSFC/Solar Dynamics Observatory


  • The Sun is a huge star that lives at the centre of our solar system
  • It’s a nearly perfect sphere of hot plasma*, and provides most of the energy for life on Earth
  • It measures a staggering 1.39 million kilometres in diameter — making it 109 times bigger than Earth
  • But its weight is 330,000 times that of Earth, and accounts for almost all of the mass in the solar system
  • The Sun is mostly made up of hydrogen (73 per cent), helium (25 per cent) and then a number of other elements like oxygen, carbon and iron
  • Its surface temperature is around 5500 degrees Celcius
  • The Sun formed 4.6 billion years ago, and it’s been in its current state for around four billion years


  • plunged: dived
  • encounter: experience, come into contact with
  • descent: dive
  • fly-bys: flying past something
  • cutting-edge: the latest or most advanced of its type
  • unprecedented: never done before
  • accelerates: speeds up
  • solar energetic particles: high-energy particles coming from the Sun
  • comprehensive: complete or including everything
  • plasma: a type of gas


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  1. What is the name of the probe?
  2. How close will the probe get to the Sun?
  3. What event is NASA specifically investigating on this mission?
  4. The mission is part of which program?
  5. What does NASA stand for?

to come

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HAVE YOUR SAY: What question would you like to ask NASA about the Sun?
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