NASA's Parker Solar Probe Makes Historic Closest Approach to the Sun

The NASA spacecraft Parker Solar Probe is on an unprecedented mission as it attempts the closest ever approach to the Sun. The probe is currently diving into our star's outer atmosphere, known as the corona, where it will face scorching temperatures and severe radiation. During this critical fly-by, the spacecraft is out of communication, and scientists are eagerly awaiting a signal expected at 05:00 GMT on December 28 to confirm its survival.Launched in 2018, the Parker Solar Probe has already completed 21 passes around the Sun, progressively getting nearer with each orbit. This Christmas Eve visit is set to be record-breaking, with the probe reaching a distance of just 3.8 million miles (6.2 million km) from the Sun's surface. While this may not initially seem close, NASA's Nicola Fox provides context: if the distance between the Earth and the Sun were scaled to one meter, the Parker Solar Probe would be only four centimeters away from the Sun.To withstand the extreme conditions, the probe employs a robust shield made from a carbon-composite material, which is 11.5 cm (4.5 inches) thick. The Parker Solar Probe will be moving at a staggering speed of 430,000 mph, allowing it to complete a journey equivalent to traveling from London to New York in under 30 seconds. This speed is a result of the intense gravitational forces as the spacecraft approaches the Sun.Scientists are eager to uncover several solar mysteries through this mission. One key question they aim to address is why the Sun's corona is significantly hotter than its surface, with temperatures reaching millions of degrees. Additionally, by collecting data on solar wind—streams of charged particles from the corona—the mission hopes to improve our understanding of space weather, which can disrupt technology on Earth and cause phenomena like auroras.As the scientists at NASA wait anxiously over Christmas for the spacecraft's signal, Fox expresses both her concerns and confidence. She notes the robustness of the craft, designed to withstand harsh conditions, and eagerly anticipates the moment when the team will receive the thumbs-up with a simple, texted green heart. If successful, the Parker Solar Probe will continue its groundbreaking exploration of the Sun, providing invaluable data for years to come.