Orbital Forensics Hint at Sun's Long-Lost Planet
Clues hidden in today’s orbits reveal the violent origins of the solar system—and, just maybe, a rogue giant kicked out long ago
Stories by Christopher Crockett
Not Just Pretty, Perseid Meteors Hold Key to Clear View of the Heavens
The Perseids meteor shower, which peaks August 11-12, isn’t just a dazzling celestial show. The annual event also supplies our atmosphere with an essential ingredient for groundbreaking astronomical research.
Glowing, Glowing, Gone: Cell Fluorescence Casts Light on How Death Spreads Throughout Body
Researchers have identified a key molecular pathway for animal death that may provide clues for better managing traumatic injury and disease in humans
Are Galaxies Playing Catch with Black Holes?
Astronomers speculate that a supermassive black hole in a distant galaxy may have been spit out from the collision of two other galaxies
Satellite Gets First Look at Sun s Tail
Artist's conception of the heliosphere, a bubble surrounding our sun carved out by the solar wind. The tail seen by IBEX is to the right of this picture.
Next Mars Rover Will Seek Out Signs of Past Life
Artists concept of Mars 2020 rover. Credit: NASA/JPL-Caltech NASA officials have revealed their vision for what comes after the wildly successful Curiosity rover on Mars.
Today the Earth Falls Towards the Sun
The Sun and Earth seen from Space Shuttle Endeavor. Credit: NASA Notice anything different today? Is the sun looking a little smaller? Or the Earth moving a little slowly?Well, today is Aphelion Day.Around 11 A.M.
NASA Adds a New Space Telescope to Its Fleet of Solar Satellites
After a ride in a cargo plane, a Pegsus rocket ignites and carries IRIS the rest of the way. Credit: NASA TV Despite being the closest star to Earth, the sun still has its secrets.
Methane in Pennsylvania Groundwater May Originate in Fracked Gas Wells
A new study links elevated levels of methane and other gases in groundwater to nearby hydraulic fracturing wells on the Marcellus shale, and suggests the problem lies in poorly designed well casings
![Channel Surfing: Are Dry Ice Sleds Carving the Surface of Mars? [Video]](https://static.scientificamerican.com/sciam/cache/file/1B07008E-B89B-41A0-85A778916534FE6F_agenda.jpg?w=275&h=154&fit=crop)
Channel Surfing: Are Dry Ice Sleds Carving the Surface of Mars? [Video]
Researchers have found that chunks of dry ice, jetting around on cushions of gas, may be responsible for mysterious channels on the Martian surface
