Galileo's Jupiter Probe . ... Credit Copyright: NASA , Galileo Project Explanation: Today, at about 5:00 pm EST, this 750 pound probe from NASA's robot spacecraft Galileo will plummet into Jupiter becoming the first probe to fly through the atmosphere of a gas giant planet. ... Pictured here before launch, the probe descent module (top)is suspended above its deceleration module aeroshell (bottom) prior to being joined. ... NASA Web Site Statements, Warnings, and Disclaimers . ...