In this time line, explore the Cold War's secret space race.—Rima Chaddha Following World War II, the United States and the Soviet Union entered into the Cold War game of spy-versus-spy that ...

Mathematicians dating back to Georg Bernhard Riemann (1826-1866) have studied the properties of multiple connected spaces in which different regions of space and time are spliced together.

Q: I keep hearing that there is a time frame of about 15 years before we have a working space elevator. I believe this time could be shortened if the country was mobilized behind this concept the ...

Time travel is possible. For example, an object traveling at high speeds ages more slowly than a stationary object. This means that if you were to travel into outer space and return, moving close ...

Very Alice in Wonderland. NOVA: Your inquiries about space travel for Contact sparked a whole new direction in research on time travel. How does that make you feel? Hear Sagan via RealAudio Sagan ...

space scientists agree that we need much bigger ... One hope is to directly measure, for the first time, the acceleration of the universe's expansion. A site will be chosen by the end of 2010.

NOVA: Are you finding new species all the time, and are they very different ... Carlton Allen of the Johnson Space Center in Houston once did experiments to determine how he could be sure that ...

NOVA: Is there a difference between the mathematical concept of infinity and infinity in terms, say, of space or time—the philosophical concept? Netz: That's the curious thing. Infinity became a ...

Answer: You ought to be a space engineer, because the people at NASA and over in Russia looked at the same concept. And essentially, metal over time suffers ... I watched you on NOVA this week ...

"The ordinary adult never gives a thought to space-time problems.... I, on the contrary, developed so slowly that I did not begin to wonder about space and time until I was an adult. I then delved ...