Discovery and exploration of the Solar System Soviet "Lunokhod 1", which landed on the Moon in 1970. The first to visit another planet was Sojourner, which travelled 500 metres across the surface of Mars in 1997. The only manned rover to visit another world was NASA's Lunar rover, which traveled with Apollos 15, 16 and 17 between 1971 and 1972. Overview of some missions to the Solar System. See also the categories for missions to , , , and . Crewed exploration of the Solar System ended in 1972. The first human being to reach space (defined as an altitude of over 100 km) and to orbit
Sustain Our Planet analysis and a list of recommendations on how a business might reduce its carbon footprint over time. Sustain Our Planet's Green Schools Program is an online teaching resource for children and educators interested in learning and practicing techniques that help protect the planet. This downloadable teaching resource contains green lesson plans, environmentally themed experiments, and green classroom activities on the carbon cycle, saving energy, recycling, and endangered animals. All content compliments the National Standards set by the US Department of Education for Science, English and Art. Sustain Our Planet Sustain Our Planet is a consulting firm that provides carbon calculation