Video Description From the Moon to Mars and from Mercury to Pluto, discover what scientists have learned about our solar system since manned space exploration began three decades ago. Is there life on Mars after all? What lies beneath the swirling gas storms of Jupiter? And what remains to be seen on Pluto when NASA lands a spacecraft there in 2001? The Comprehension Questions are available to download as an RTF file. You can save the file to your desktop and open it in a word processing program.