Cassini - Launched in 1997, the Cassini satellite is scheduled to reach its destination at the planet Saturn by 2004. Onboard the satellite are 12 scientific instruments whose purpose is to make up-close studies of Saturn, its rings, magnetic environment, and its moons. The satellite should remain in orbit of the planet from 2004-2008. It will also release a probe, named Huygens, developed by the European Space Agency to land on the surface of the moon Titan.
Genesis - Scheduled for launch in 2001, the Genesis spacecraft will travel towards the hottest spot in our solar system, the sun itself. After traveling about a million miles towards the sun, the spacecraft will unfold its collectors and sit, for two years, collecting as much of the solar wind as it can. It will then return to earth with its collection.
Deep
Space 1 - Truly a mission meant to test out new technologies. Deep
Space 1 was launched in 1998 and orbits earth. One of its missions was to
take close-up studies of an asteroid that came close to earth. Another possible
study may be to perform close-up studies of two comets as they pass by the
earth. Some of the new technologies onboard the spacecraft include an ion
propulsion engine, an onboard navigation system using images of the stars,
and warning indicators that notify NASA when human intervention is needed
to fix problems on the spacecraft. 
Deep Space 2 · Mars Microprobe - One of the main objectives of this mission, like the Deep Space 1, is to test out new technology. Rather than put this technology to waste, however, Deep Space 2 will voyage to Mars to perform some scientific studies. Tests will be done to determine if ice exists under the surface of the planet. The mission also plans to determine the thermal properties of the subsurface soil, characterize the atmospheric density, characterize the hardness of the soil, and determine if there is any layering of soil.
Galileo - Launched in 1989, Galileo arrived at the planet Jupiter in 1995. The next two years were spent capturing images and statistics about the planet while also gathering information about Jupiter's moons. Next, the spacecraft would spend two years studying Jupiter's moon Europa. After that, it would travel over to Io and explore the large amounts of volcanic activity on the moon.
Lunar
Prospector
- Launched in 1998, this probe was sent to the moon to try and get a better
understanding of its features as well as answer the long-standing question
of whether there was truly ice in the craters at the moons polar cap. Mars
exploration - There have been a number of missions to Mars, all of which hoping
to find some answers to many of the questions held by our small neighbor.
Questions such as whether water existed on the planet, life ever existed there,
and if there is any way we can set up a colony. 
These are just some of
the missions sent to Mars:
Mars Pathfinder - Last spacecraft to land
on the planet to take surface samples.
Mars Global Surveyor - Currently orbiting
the planet taking data.
Mars Surveyor 98 - Currently en route
to Mars. Mars Surveyor 2001 - Mission
currently under development.
Near-Earth
Asteroid Rendezvous (NEAR) - This will be the first satellite ever
to orbit an asteroid. Scientist hope that the data discovered during the satellite's
orbit about the asteroid will give them a better understanding of asteroids
themselves. Hopefully, with a better understanding of these massive objects
we will be able to make better predictions of their behaviors know sooner
whether or not they may impact the path of earth.
Pioneer 10 - Pioneer 10 was the first satellite to ever cross the asteroid belt. It was launched back in 1972 and provided some of the first information on both Jupiter and Saturn. It also made returned valuable data on the outer reaches of our solar system. It is currently on a path to the constellation of Taurus the bull. It is expected to take two million years for pioneer to reach the first stars in the constellation.
Voyager 1 and 2 - These primary focus of these missions, launched in 1977, is to escape the suns influence and return readings from interstellar space. Voyager 1 performed close flybys of Jupiter and Saturn before beginning its journey to the outer reaches of our solar system. Voyager 2 not only performed close flybys of Jupiter and Saturn, but of Uranus and Neptune as well. Voyager 2 is also on a path for the outer reaches of the solar system. The hope of the missions is that by escaping the magnetic influence of the sun and the solar wind, we can get better reading from other stars and galaxies and get a better understanding of what the rest of space is truly like.
Stardust - The Stardust mission, launched in 1999, will be the first mission in history to return extraterrestrial material from outside of the moon's orbit. The spacecraft is set to rendezvous with the comet Wild 2 in 2004 and obtain samples from it. It will also obtain samples of the interstellar dust streaming into our solar system from the direction of Sagittarius. It will then return with these samples so scientists can study them more closely.
Solar and Heliospheric Observatory (SOHO) - Launched in 1995, SOHO is constantly studying every aspect of the sun, from the core itself to the solar wind. It sits about 1.5 million kilometers away from earth in the direction of the sun. SOHO is a joint cooperation between the European Space Agency and NASA.
