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In General

• Which planets have been approached by spacecraft from Earth?
• Which planets have spacecraft from Earth landed on?
• On which bodies outside the Earth have humans actually been?

Terrestrial Planets

• Are there any current or planned missions to Mercury?
• Are there any current or planned missions to Venus?
• Are there any current or planned missions to the Moon?
• Are there any current or planned missions to Mars?

Jovian Planets

• Why were the late 1970's a good time for NASA to launch spacecraft to the Jovian planets?
• What was the purpose the Pioneer missions, that NASA sent before Voyager 1 and 2?
• Why was the region beyond the orbit of Mars considered to be dangerous for spacecraft?
• What spacecraft first reached Jupiter, and which one was the major explorer of Jovian planets?
• What surprise did Pioneer find around Jupiter that forced to redesign the Voyager missions?
• How did the Voyager images of Jupiter and its moons compare to the scientists' expectations?
• How did the Voyager images of Saturn and its rings compare to the scientists' expectations?
• Which planet was somewhat of a disappointment to NASA scientists?
• Why was the moon Miranda the most striking thing that Voyager saw around Uranus?
• How did the Voyager images of Neptune and its winds compare to the scientists' expectations?
• What is strange about Neptune's ring, and Do we understand the reason?
• Why is Neptune's moon Triton remarkable?
• How long did it take the Voyager spacecraft to complete their tour of the outer Solar System?
• What did the Pioneer 10 and 11 spacecraft do? What happened to them eventually?
• Where did the Voyager 1 and 2 spacecraft? What happened to them eventually?
• Which ones of the four large planets have been visited or will soon be visited again?
• Have other spacecraft gone to Jupiter after Voyager? Any current or planned missions?
• Have other spacecraft gone to Saturn after Voyager? Any current or planned missions?
• Which spacecraft is on its way to Saturn, and when will it get there?
• Have other spacecraft gone to Uranus/Neptune after Voyager? Any current or planned missions?

Time Travel

• What possibilities are scientists considering for time travel?
• What problem is a major concern for scientists considering time travel?