Word: planet
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Dates: during 1990-1999
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...covering the sphere can get pricey. In 1993, before NASA's Mars Observer spacecraft had even entered orbit around the planet, it blew an aneurysm in a fuel line and spun off into the void, taking nearly $1 billion of NASA funding with it. The twin Viking spacecraft, which accomplished their missions successfully, landing on Mars in 1976, nonetheless set taxpayers back about $3 billion...
...similar ships poised to fly. Every 26 months the orbital minuet that Earth and Mars dance around the sun brings them close enough to make interplanetary travel practical. NASA plans to take advantage of those exploratory windows, sending at least three other lander-orbiter pairs to the Red Planet in 1998, 2001 and 2003. In 2005 the agency hopes to exceed even these ambitious plans, launching the first-ever round-trip Mars ship, one capable of landing somewhere on the surface, then flying back to Earth carrying with it a few precious handfuls of rock and soil...
...Charon, tentatively set to launch in 2001; a comet-rendezvous mission that will take off in February 1999, fly by Comet Wild 2 in 2004 and fly back home with a bit of material from its diaphanous tail; and perhaps even a much-dreamed-of journey to Neptune's planet-size moon Triton. Says Goldin: "We're going to have the most aggressive exploration of our own solar system in the history of the human species...
...cosmos. Mars and Earth, after all, have been throwing rocks and machines at each other for eons. Last summer an ancient Martian meteorite gave the creatures of Earth the first compelling evidence of life beyond our own. This summer the creatures on Earth answered back, sending our sister planet evidence not just that terrestrial life exists, but that it is--when it tries to be--wonderfully intelligent...
...that enabled J.P.L. controllers to choose a safe spot for Viking 1's lander to touch down. On July 20, lander 1 separated from its orbiting mother ship. Using retrorockets, deploying a parachute and finally firing three descent engines, it bumped gently onto a rock-covered slope on the planet's southern hemisphere. Forty-five days later, the Viking 2 lander plopped down on more rugged terrain far to the north...