The objects within galaxies have two basic types of motions: orbiting around the galaxy centre in a regular organized disc, or in orbits oriented at random without a clear direction of rotaiton ...

So successful was the project that it spawned Galaxy Zoo 2 in February 2009 to classify another 250,000 SDSS galaxies. To date, more than 57 million classifications have been made by some 265,000 ...

Over the years, astronomers have developed many classification systems for stars, planets, galaxies, asteroids, meteorites, and comets. But no overall umbrella system has existed for all objects ...

Sidney van den Bergh, Weidong Li, Alexei V. Filippenko, Classifications of the Host Galaxies of Supernovae, Set II, Publications of the Astronomical Society of the Pacific, Vol. 115, No. 813 (November ...

But some researchers are thinking bigger. In recent years, astronomers have been investigating whether some types of galaxies are more hospitable to life than others.