NASA solar probe becomes first spacecraft to 'touch the sun'

After spending 990 days speeding through the solar system and zipping around Venus and our home star, NASA's Parker Solar Probe has achieved the headline goal of its mission: It "touched the sun."

More specifically, an instrument aboard the probe, which was launched on Aug. 12, 2018, notified scientists back on Earth that the spacecraft had crossed a critical threshold and was within the sun's corona -- a furnace of unfathomable proportions, where temperatures can reach up to 3 million degrees Fahrenheit. The announcement was made at the annual meeting of the American Geophysical Union in New Orleans on Tuesday. Michael Stevens, an astronomer at the Center for Astrophysics (CfA), Harvard and the Smithsonian, explained that the probe had to cross the Alfvén point, a fuzzy layer where the sun's magnetic field holds the star's plasma and wind tightly. An instrument on Parker, developed by CfA, determined that Parker had passed the point three times on April 28 -- entering the corona and high-fiving the sun. Parker is a remarkable probe. It's the fastest laboratory ever built, using gravity to swing around Venus and the sun and to gather speed across its orbit. It's also the closest human-built object to the sun -- its recent closest approach, in November, put it within 5.3 million miles of the sun. For reference, Mercury is around six times further away, at 36 million miles. Read more...

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