New Milky Way Map Created; Shows Fewer Main Arms

Publication: National Geographic News   Date: June 3, 2008   View Article

Astronomers unveiled today what they are calling the best map ever produced of the Milky Way galaxy. The new view shows our spiral galaxy as it would look face-on to a very distant observer.

Perfectly Aligned Galaxies Found For the First Time

Publication: National Geographic News   Date: January 11, 2008   View Article

Astronomers have found three galaxies in a never before seen perfect alignment—a discovery that may help scientists better understand the mysterious dark matter and dark energy believed to dominate the universe.

The three galaxies are like beads on a string, one directly behind the other, scientists announced yesterday at a meeting of the American Astronomical Society in Austin, Texas.

New Dark Matter Map Shows Violent Life of Galaxies

Publication: National Geographic News   Date: January 10, 2008   View Article

In galaxy clusters, the rough-and-tumble outer suburbs are where most galactic change occurs, a team of astronomers announced today.

There, galaxies harass, strangle, and strip away at each other as they are pulled from the outskirts of a cluster to the inner core by the gravity of dark matter, according to the new research.

Ancestors of Milky Way-Type Galaxies Found, Analyzed

Publication: National Geographic News   Date: January 9, 2008   View Article

Scientists have peered back into the earliest epochs of the universe and discovered the types of galaxies that form modern galaxies, including spiral types like our Milky Way.

The newfound galaxies represent some of the first to form in the universe—their light has traveled between 9 and 12 billion years to reach Earth, the bulk of the universe’s 13.7-billion-year existence.

Photo in the News: Chandra Solves Supernova Mystery

Publication: National Geographic News   Date: January 11, 2007   View Article

The most detailed x-ray image yet of one of the youngest known supernova remnants—the debris cloud created when a massive star explodes—solves a long-standing mystery about how the star died, an astronomer announced on Tuesday.

New Alien-Life Search Aims to Eavesdrop on ETs

Publication: National Geographic News   Date: January 11, 2007   View Article

Do extraterrestrials sweep their skies with radar to scan for incoming missiles?

If so, Avi Loeb of the Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusetts, thinks he can find the radio signals leaked from warring alien civilizations.

Eight New Neighboring Galaxies Found, Scientist Announce

Publication: National Geographic News   Date: January 10, 2007   View Article

Earth’s home galaxy, the Milky Way, has at least eight more galactic neighbors than previously known, scientists announced yesterday—and dozens more finds are expected in the coming years.

The discoveries, made over the past two years, nearly double the number of Milky Way neighbors found in the prior 70 years.

© 2008-2010 Collected Writings By John Roach