All Stories by Ron Cowen
- Astronomy
New Images: They Might Be Planets
Astronomers have for the first time obtained images of as many as 18 objects beyond our solar system that, based on their mass alone, could qualify as planets.
- Astronomy
Stellar motions provide hole-y data
Measuring for the first time the acceleration of stars near the dense core of our galaxy, astronomers have obtained more precise information on the location and density of the black hole that lurks there.
- Astronomy
Gang of four: Debut of a big telescope
In the desert of northern Chile, a fourth 8.2-meter telescope opened for business, completing a quartet known as the Very Large Telescope.
- Astronomy
Craft finds where sun’s corona gets its hots
New findings may help explain an enduring solar riddle: Although the sun's outer atmosphere lies thousands of kilometers above the visible surface of the sun, it's about 1,000 times hotter.
- Astronomy
Spirograph in the sky
Some 2,000 light-years from Earth, an elderly star has ejected its outer layers to form a puffy, gaseous cocoon that resembles a "spirograph" pattern.
- Astronomy
Magnetic-mapping mission resurrected
The European Space Agency successfully launched Cluster II, a group of four spacecraft that will fly in tandem to generate a three-dimensional map of Earth's magnetosphere.
- Astronomy
Ulysses makes a return trip
Just as the sun has reached the stormy peak of its 11-year activity cycle, the European Space Agency's Ulysses spacecraft has begun its second and final pass over the sun's poles.
- Physics
Through the Looking Glass
A proposed universe of unseen material, where every ordinary particle has a shadowy counterpart, could explain several conundrums in cosmology.
- Astronomy
Telescope unveils a stellar deception
A heavenly masquerade may shed light on the nature of astrophysical jets—the beams of material spewed by a wide variety of celestial objects.
- Astronomy
Taking a census of brown dwarfs
Researchers have completed the most thorough census to date of brown dwarfs in stellar clusters and have confirmed earlier findings about these failed stars.
- Astronomy
A new receiver for alien broadcasts
A $12.5 million grant will help build the world's largest telescope designed to search for radio broadcasts from alien civilizations.
- Astronomy
Neutron stars twist Einstein’s theory
Astronomers may finally have found evidence of a key prediction of Einstein's general theory of relativity—that a spinning object drags space-time along with it.
