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How could traveling the speed of light lead us to time travel?

By admin ⋅ September 21, 2008 ⋅ 12 comments

gcolor7of12 asked: In a question, someone answered that if we were able to travel the speed of light, then we could somehow achieve time travel. How would this happen?
Also, how could we make time travel possible? Is there some formula to it? I think time travel is a really awesome concept, and I want [...]

Multiple Choice: What motion causes sun to trace out ecliptic? What causes the north star to change?

By admin ⋅ September 20, 2008 ⋅ 4 comments

helpme! asked: Which of the following motions of earth causes the sun to trace out a path eastwards against the background of stars cakked the ecliptic?
a) rotation
b) revolution
c) precession
d) all of the above
Which of the following motions of earth causes the star we designate as the North Star to change over time?
a) rotation
b) revolution
c) precession
d) [...]

What causes the apparent retrograde motion of the planets?

By admin ⋅ September 11, 2008 ⋅ 3 comments

divapink018 asked: A. As Earth passes another planet, its gravitational pull slows down the other planet so that it appears to be traveling backward.
B.When planets are farther from the Sun, they move slower than when they are nearer the Sun; it is during this slower period that they appear to move backwards.
C.The [...]

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