Scientists now believe that the current laws of physics allow us to travel though time. ... Einstein's general relativity theory explains about universal constants, this is important to understand the concepts of travel at light speed. ... Time for a stationary observer on earth and for an astronaut on a spaceship of high velocity is different. ... Carl Sagan wrote a science fiction novel about a fictional device that allowed his character to travel great distances across the universe. ... When the machines are placed in close proximity of each other the enormous amounts of energy, about ...

• Word Count: 2726
• Approx Pages: 11
• Grade Level: High School