... To answer this question, the robot spacecraft Galileo currently in orbit around Jupiter was maneuvered to image the plume site during its recent flyby of Io in August. The Earth and Moon Planetary System . ... How similar in size are the Earth and the Moon? ... Galileo Demonstrates the Telescope . ... Knowing when and where to look, many enthusiastic sky gazers have been able to spot the International Space Station (ISS) as a bright star streaking through the twilight. ...