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" ... Our dominance of low-Earth orbit has led to an unprecedented understanding of our world, the processes driving it, and how our environment and our biological functioning are intertwined. But our goal was never to be content with incremental advances or the development of a few new materials and technologies; the goal of space exploration is to explore what's out there. While robotic missions, landers, rovers and orbiters have done a tremendous job, they lack the one ingredient necessary to solve problems and make brilliant, on-the-fly decisions: a human brain. Artificial intelligence may someday overcome that tremendous hurdle, but that day has not yet arrived. ... "
" ... There is a tremendous hope that current and future generations of Mars rovers and orbiters will help us finally puzzle out whether Mars — either now or at any point in its past — has ever harbored life. If the answer to that question is affirmative, then it leads to an important follow-up question: is that life related to or independent of life on Earth? It is possible that life originated on Earth and seeded Mars with life; it’s possible that life originated on Mars and then seeded Earth; it’s even possible that life predated both Earth and Mars, and early forms of it took hold on both planets. ... "
" ... This photo composite shows Meande Ring, a river on Mars, as captured by Mariner 9. Multiple ... [+] orbiters, from both NASA and the Soviet Union, reached Mars starting in 1971. Mariner 9 mapped 85% of the Martian surface, becoming the first spacecraft to do so. But it would be much longer before we began exploring the Martian surface directly. (© CORBIS/Corbis via Getty Images) ... "
" ... “Discovery was the third Space Shuttle orbiter to fly in space. From 1984 to 2012, Discovery flew 39 Earth-orbital missions, spent a total of 365 days in space, and traveled almost 240 million km (150 million mi) —more than the other orbiters. NASA transferred Discovery to the Smithsonian in April 2012 after a delivery flight over the nation's capital.” ... "