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Cygnus X-1

Doppler studies of this blue supergiant in Cygnus indicate a period of 5.6 days in orbit around an unseen companion. The mass of the companion is calculated to be 8-10 solar masses, much too large to ...

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Escape Velocity Calculator

Use this site to find the velocity for a body to escape orbit.

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Junk in Space

There's a lot of rubbish out there.... Collect space junk in orbit around the Earth in this fun game.

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Could An Asteroid Impact Knock The Moon Into Earth?

A brief examination whether it would be possible to knock the Moon out of its orbit.

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Astro Tour

Examine our solar system's planet's orbits from all angles with this interactive site.

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Hits: 1625

Circular Motion and Satellite Motion

In depth site explaining circular motion and how satellites orbit the Earth.

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Hits: 9698


Global Positioning System

In June of 1993 the last of the 24 satellites of the Global Positioning System was placed into orbit, completing a satellite network capable providing position data to locate you anywhere on Earth ...

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Magnetic Field

Magnetic fields are produced by electric currents, which can be macroscopic currents in wires, or microscopic currents associated with electrons in atomic orbits. The magnetic field B is defined in ...

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Hits: 4386

Why do all planets spin and orbit in the same direction?

Read how angular momentum is the reason makes all the planets spin in the same direction.

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Tycho Brahe

A biography of Danish astronomer Tycho Brahe (1546 - 1601), who made a remarkable star catalogue of over 1000 stars, far more than any astronomer before him. He proved that comets are not objects in ...

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