The beginning of a historic journey to fly closer to Sun...

Tomorrow's launch of our Parker #SolarProbe spacecraft marks the beginning of a historic journey to fly closer to Sun than any other human-made object. Here’s what we hope to learn from the mission that launches at 3:31 am ET on Sunday, Aug. 12: https://t.co/N5Psu9bQjs pic.twitter.com/6ZMxtwas8y

— NASA (@NASA) August 12, 2018