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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 ...
A brief examination whether it would be possible to knock the Moon out of its orbit.
Use this site to find the velocity for a body to escape orbit.
There's a lot of rubbish out there.... Collect space junk in orbit around the Earth in this fun game.
In depth site explaining circular motion and how satellites orbit the Earth.
Examine our solar system's planet's orbits from all angles with this interactive site.
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 ...
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 ...
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 ...
Nicolaus Copernicus (1473 - 1543) provided a model of the universe in which the earth and all the other planets orbit around the sun and the earth acquired a daily rotation, but the sun itself was ...
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