News in Brief: Atom & Cosmos

Liquid water possible on Earthlike planet, plus black-hole atoms, Io’s magma ocean and more in this week’s news

News in Brief: Atom & Cosmos

Titans liquid-water ocean
Known for its hydrocarbon lakes and methane-rich atmosphere, Saturns moon Titan may contain a water ocean beneath its icy shell, a new study suggests. The moons orbit, rotation and related properties can best be explained if Titan isnt solid throughout but harbors a subsurface ocean of water, researchers from the Royal Observatory of Belgium in Brussels report in an upcoming Astronomy & Astrophysics. Ron Cowen

Ios magma ocean runs deep
A new study ends any doubt that Jupiters moon Io, the solar systems most volcanically active body, has an internal ocean of magma. The study also reveals that the ocean must be more than 50 kilometers deep, researchers report online May 12 in Science. Krishan Khurana of UCLA and his collaborators base their findings on a reanalysis of data recorded by NASAs Galileo spacecraft. Ron Cowen

Black-hole atoms
Instead of evaporating, miniblack holes created during the Big Bang may survive and trap nearby particles into stable orbits, forming the gravitational equivalent of atoms. These survivors could contribute to the dark matter that makes up most of the cosmos mass. Such atomlike systems on or near Earth weighing at least 1,000 tons may be detected through emissions produced when the trapped matter falls from a higher to a lower energy state, just as electrons orbiting atoms do. Researchers from Sandia National Laboratories in Albuquerque and Halcyon Molecular in Redwood City, Calif., describe their idea in a paper posted May 3 at If such systems exist, they would shed light on black hole evaporation and quantum gravity. Ron Cowen

SuperEarth may have liquid water
Gliese 581d may be the first planet only a few times heavier than Earth that is known to reside in its stars habitable zone, the region where water would remain liquid on the bodys surface. A team of French scientists came to that conclusion after detailed climate simulations of the planet, dubbed a superEarth because it weighs about 5.6 times Earths mass. Because of its relatively large distance from the star Gliese 581, the planet one of six orbiting the star had been thought too cold to have liquid water on its surface. But the new model says otherwise, the team reports in an upcoming Astrophysical Journal Letters. Ron Cowen