One halcyon spring day in 1903, the 69-year-old anatomist and naturalist Dr. James Bell Pettigrew sat at the top of a sloping ...

A century ago, Edwin Hubble revolutionized our understanding of the universe by proving that the Milky Way is just one of many galaxies in an ever-expanding cosmos. This breakthrough led to the ...

The essential features of this hypothesis are that the Solar System has been formed from a spiral nebula, and that the planets have not been detached from the central mass through its rotation but ...

Shapley insisted that the mysteriously fuzzy "spiral nebulae," such as Andromeda, were simply stars forming on the periphery of our Milky Way, and inconsequential. Little could Hubble have ...

"This allows the most energetic particles to escape the confines of the Guitar Nebula and fly to the right of the pulsar, creating the filament of X-rays. When those particles escape, they spiral ...

The second key was the work of Vesto Slipher, who had investigated the spiral nebulae, before Hubble's Andromeda discovery. These bodies emit light which can be split into its component colors on ...

He had discovered these objects while working at the Mount Wilson observatory near Pasadena, California, including in images of a striking ‘spiral nebula’ in the constellation of Andromeda ...

A magnitude 10.2 star lies a bit more than 2″ east of the nebula. A big neighbor This week’s second large-telescope target is barred spiral galaxy NGC 3109 in the constellation Hydra the Water ...

and the spiral galaxy C48. Those in the Southern Hemisphere are encouraged to look for planetary nebula C90 in addition to the four cosmic objects listed for the Northern Hemisphere.

Amid this nebula's massive stars and hydrogen gas is ... Sixty-eight million light-years from Earth, the spiral galaxy NGC 1385, shines in a constellation named Fornax, which is the Latin word ...

The second key was the work of Vesto Slipher, who had investigated the spiral nebulae, before Hubble's Andromeda discovery. These bodies emit light which can be split into its component colors on ...