A primary reason is that viruses do not possess a cell membrane or metabolise on their own - characteristics of all living organisms. Examples of common human diseases caused by viruses include the common cold, the flu, chickenpox and cold sores.
In the past spacecraft have taken greatly different amounts of time to make it to Saturn. Pioneer 11 took six and a half years to arrive. Voyager 1 took three years and two months, Voyager 2 took four years, and the Cassini spacecraft took six years and nine months to arrive. The New Horizons spacecraft took a short two years and four months to arrive on the scene.
The time it takes to get to the moon depends on the speed of the spacecrafts. The Apollo 11 was launched July 16, 1969 from Kennedy Space Centre and landed on the moon on July 19th. It took a total of 3 days, 3 hours and 49 minutes to fly to the Moon and 3 days to return to Earth.Afterwards, on April 11, 1970, Apollo 13 was launched from the Kennedy Space Centre and landed on the Pacific Ocean after traveling around the Moon on April 17th.he shortest trip to the Moon took place in January 2006 by the NASA Pluto probe New Horizons. With the speed of 58,000 km/hr, it only took 8 hours and 35 minutes to get to the Moon from Earth.