All Stories by Ron Cowen
- Astronomy
Alien stars pass close to home
Stars from an alien galaxy are raining down on our own Milky Way and passing just a few hundred light-years from Earth.
- Astronomy
Solar Flip-Flops: Sun storms spawn magnetic reversal
Coronal mass ejections, billion-ton clouds of charged particles blasted from the sun, appear to play a key role in reversing the sun's magnetic poles every 11 years.
- Planetary Science
Giant picture of a giant planet
The Saturn-bound Cassini spacecraft has taken the sharpest global portrait of Jupiter ever obtained, showing the planet's turbulent atmosphere in true color.
- Planetary Science
Moonopolies
Recently discovered tiny satellites, all orbiting the outer planets in strange paths, may shed new light on a critical last phase in the formation of the planets.
- Astronomy
Sound of the fury
On Oct. 28, the Saturn-bound Cassini spacecraft recorded the radio wave "sound" of a powerful solar flare as it raced toward Earth.
- Astronomy
Chow Down! Milky Way gobbles its closest known neighbor
A tiny, newly discovered galaxy being shredded by the gravity of the Milky Way is our galaxy's closest known neighbor, residing just 42,000 light-years from the Milky Way's center.
- Astronomy
Hot and Heavy Star Birth: Young cosmos delivers massive stars
Aided by a gravitational zoom lens, astronomers have discovered the hottest, brightest, and most crowded star-forming region ever observed.
- Planetary Science
Bone-dry Mars?
The presence of large amounts of olivine, a mineral that undergoes rapid chemical transformation when exposed to liquid water, argues against ancient oceans or lakes on Mars.
- Planetary Science
Martian Invasion
If all goes according to plan, three spacecraft—one in December, two in January—will land on the Red Planet, looking for evidence that liquid water once flowed on its surface.
- Astronomy
Cosmic Survey: Galaxy map reveals dark business as usual
The most precise map of how galaxies cluster, pulled together by the tug of gravity, has confirmed that most of the cosmos is in the dark, consisting of 5 percent ordinary matter, 25 percent dark matter, and 70 percent dark energy.
- Astronomy
When really big winds collide
A newly released image shows dramatic details of the Crescent nebula, a giant gaseous shell created by outbursts of a massive star about to explode as a supernova.
- Astronomy
Vanishing planet
An object orbiting a distant star is too heavy to be a planet, researchers have concluded.
