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The launch of our Parker #SolarProbe spacecraft marks the beginning of a historic journey to fly closer to Sun than any other human-made object. The spacecraft will travel almost 90 million miles and eventually enter through the Sun's outer atmosphere to encounter an environment of intense heat and solar radiation. Here's what we hope to learn from the mission that launches at 3:33 am ET on Saturday, Aug.11https://www.facebook.com/profile.php?id=100094051087357