The problem of traveling to the stars must also be viewed from an entirely different perspective than is useful for understanding our recent flights to the moon and flights of instrument packages to other planets. Distances within the solar system can be measured in light-seconds, light-minutes, or at most in a few light-hours. Stars are at least several light-years away. Our chemical rockets carry astronauts to the moon in about sixty-nine hours, and the Viking spacecraft to Mars took about ten months to reach its destination. But they are propelled by forces other than gravity for only seventeen minutes or one hour respectively. The rockets are coasting and slowing down until they are close to the target for almost the entire trip. The Apollo spacecraft, at an altitude of two hundred thousand miles, is going only two thousand mph although it left the vicinity of earth at twenty-five thousand mph. If it had been able to accelerate at just one G (a twenty-one-mph increase every second) for just one hour, the final velocity would have been 79,000 mph; for just one day it would have been 1.9 million mph! Peak acceleration during an Apollo launch is actually close to eight Gs (a 168-mph increase every second). To understand the foregoing a bit better, note that an acceleration of one G at the surface of the earth equals 32.17 feet per second, which in turn means that as each second passes velocity is increasing by an additional 32.17 feet. Translated into miles per hour one-G acceleration means that velocity is increasing at the rate of 21.9 mph every second! At the end of two seconds it is 21.9 mph plus 21.9 mph, or 43.8 mph, and at the end of three seconds it is 64.7 mph, and so on.

In just one day at one-G acceleration a velocity of almost two million mph would be reached and the craft would be far out of the earths gravitational field. For each minute of operation near the earth, gravity effectively pulls the craft at 1260 mph. While in space there is practically no gravitational or atmospheric friction. It is extremely important to recognize that it takes only approximately one year at one G to approach the speed of light--about 670,000,000 mph---and we can speculate that any space travelers may have refueling or rest and relaxation centers at locations between the stars, so that our earth visitors need not have come directly from their home planet.
As for 9/11
Hi , just a few questions with regards to this matter can you answer any of them??
1. How d