Killer electrons are highly energetic particles trapped in Earth's outer radiation belt.

As Celestron turns 50 this year, the leading telescope manufacturer remembers its accomplishments and looks forward to the future.

Scientists found that Mars' atmosphere does not drift away at a steady pace; instead, atmospheric escape occurs in bursts.

The clusters appear to be moving along a line extending from our solar system toward Centaurus/Hydra, but the direction of this motion is less certain.

The American Association of Variable Star Observers' Citizen Sky project promotes a beginner-oriented program to study Epsilon Aurigae. No special equipment is needed, as observers can readily see Epsilon Aurigae with the unaided eye.

Whether channels on Mars were formed by water or by lava has been debated for years.

Mars Express data collected about this martian moon will tell scientists how much of Phobos' interior is composed of void.

Professor William Gutsch, Ph.D. was elected president of the Astronomical Society of the Pacific

This discovery indicates that "average" supermassive black holes may play an important role in the evolution of the galaxies in which they reside.

NGC 1788 is a subtle, hidden treasure just a few degrees away from the bright stars in Orion's belt.

This newly discovered star supports theories that our galaxy grew by absorbing dwarf galaxies and other galactic building blocks.

The results also confirm the strength of dark energy, responsible for accelerating the expansion of the universe.

Scientists have detected ice deposits near the Moon's north pole.

Eleven-year-old Adam Atanas of Houston wins a trip to the Northeast Astronomy Forum and Telescope Show (NEAF) with his entry for Astronomy's 2010 Youth Essay Contest. Youths ages 9 to 17 submitted essays detailing what they love best about astronomy.

Amid nearly 30 submissions from 20 states and four other countries, the Amateur Observers' Society of New York wins Astronomy's contest to celebrate astronomy outreach programs.

This observation could help answer questions about why there is more matter than anti-matter in the universe.

The new images also include the best 3-D image ever obtained of a "tiger stripe," a fissure that sprays icy particles, water vapor, and organic compounds.

Scientists ask public for help in understanding the Sun.

Cincinnati Observatory Center's "40 Galileos" project — winner of Astronomy magazine's 2008 Out-of-this-World award for public programming — graduates its first class of astronomy outreach leaders. Dean Regas, COC's outreach astronomer, provides this third and final report of the project's first year. Astronomy magazine will announce the winner of the 2009 award March 1.

The Endeavour crew return to Earth after delivering the last major U.S. portion of the International Space Station.