Uncovering The Mystery Of The Spiral Nebulae. At the dawn of the 20th century, the nature of the night sky’s “spiral nebulae” ...

An unusual x-ray signal from the Helix Nebula, first detected in 19180, could stem from a star destroying a nearby planet. Credit: NASA/CXC/A. Hobart ...

A third category – nebulae with spiral structure – particularly intrigued astronomers. The Andromeda nebula, M31, was a prominent example. It’s visible to the naked eye from a dark site.

Hubble worked hard, taking images of spiral nebulae every clear night and looking for the telltale variations of Cepheid variables. By the end of 1924, he had found 12 Cepheids in M31.

M51’s pronounced arms caused astronomer William Parsons, Earl of Rosse, to call it a “spiral nebula” in 1845. In the two centuries that followed, ...

Putting Isaac Roberts’ astonishing 1888 photographs of the Great Nebula in Andromeda and other spiral nebulae to cosmic effect at his argument’s outset, Pettigrew then immersed the reader in a ...

About 100 years after astronomer Edwin Hubble's discovered the "magnificent" spiral nebula, the Hubble Space Telescope and NASA scientists have produced the most comprehensive survey of the ...

Slipher, working with a small telescope equipped with ingenious spectroscopes, had found that spiral nebulae move at high speeds, mostly away from us — which is usually regarded as Hubble’s ...

The headline read: Finds Spiral Nebulae are Stellar Systems: "Dr. Hubbell Confirms View That They Are 'Island Universes'; Similar to Our Own." On Sunday November 23, 1924, ...

IN “Our Astronomical Column” of NATURE of August 2, reference is made to Prof. Perrine's letter on Prof. Lindemann's spiral nebula hypothesis which appeared in the Observatory for July. As ...