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Subrahmanyan Chandrasekhar

Subrahmanyan Chandrasekhar (1910 - 1995) In 1930 he showed that a star of a mass greater than 1.4 times that of the Sun had to end its life by collapsing into an object of enormous density unlike any ...

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National Earthquake Information Centre - Near real time earthquake list

Contains information on the most recent earthquakes around the world - less than 14 hours ago. Also data - predicted p-wave times for example. An excellent site for keeping abreast of the latest ...

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Fermat Principle

The path of a ray of light between two points is the path that minimizes the travel time. This java applet lets you visualize the above statement. Useful for college level students and those study ...

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The Speed of Light - A Limit on Principle?

Paper discussing the possibilities for superluminal (faster-than-light) travel. Geometric and algebraic comparison of Galilean and Minkowski space-time properties. Several links and references.

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50 Highlights of Space Travel

A great timeline showing the major achievements in space travel over the last 50 years.

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The Physics of Interstellar Travel

Michio Kaku explores the possibility of interstellar travel

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Time

The Official Source of Time for the Department of Defense and the Standard of Time for the United States.

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A Walk Through Time

How do you measure time? A guided tour of the history of the measurement of time from ancient calendars and sun dials to modern day atomic clocks.

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Interstellar Travel Please

Mae Jemison, the former NASA astronaut and the first African American woman in space talks about interstellar space travel.

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Do faster than light neutrinos let you change the past?

What would faster than light neutrinos mean for time travel?

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