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

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.

The powerful device will scan the sky like never before, capturing vast amounts of data to reveal how the universe changes ...

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 ...

Many scientific terms are very specific, but the term nebula is, well, nebulous. In a very generic sense, it simply means a fuzzy thing. But there are a wide variety of astronomi ...

The first test images from the Vera C. Rubin Observatory in Chile showcase thousands of previously unknown asteroids and ...

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 ...

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, ...