Astronomers studying hydrogen gas clouds found in and above the Milky Way Galaxy have discovered that the clouds have preferred locations in and around the galaxy, a fact which has given astronomers a key clue about galaxy evolution.
Astronomers studied gas clouds in two distinct regions of the Galaxy. The clouds they studied are between 400 and 15,000 light-years outside the disk-like plane of the Galaxy. The disk contains most of the Galaxy's stars and gas, and is surrounded by a "halo" of gas more distant than the clouds the astronomers studied.
The more "macho" the man, the more risks he is likely to take on the road, according to a study by a psychologist at the University of Montreal.
So what is a macho man? In 2004, an American researcher developed the Auburn Differential Masculinity Inventory, a questionnaire to identify such men. It comprised 60 statements such as "men who cry are weak," or "generally speaking, men are more intelligent than women." Men had to answer questions on a scale of one (strongly disagree) to five (strongly agree).
Scientists have reconstructed the formation of a chasm larger than the Grand Canyon and a series of spiral troughs under the northern ice cap of Mars—solving a pair of mysteries dating back four decades while finding new evidence of climate change on Mars.
In a pair of papers to be published in Nature, researchers from the University of Texas at Austin's Institute for Geophysics describe how they used radar data collected by NASA's Mars Reconnaissance Orbiter to reveal the subsurface geology of the red planet's northern ice cap.
On Earth, large ice sheets are shaped mainly by ice flow. But on Mars, according to this latest research, other forces have shaped, and continue to shape, the polar ice caps.
With the official start of hurricane season approaching on June 1, news reports about the Deep Horizon oil spill that began fouling the Gulf last month have raised questions about how a hurricane might complicate the unfolding disaster.
A new study in Geophysical Research Letters suggests that hurricanes could snap offshore oil pipelines in the Gulf of Mexico and other hurricane-prone areas, since the storms whip up strong underwater currents.
These pipelines could crack or rupture unless they are buried or their supporting foundations are built to withstand these hurricane-induced currents. "Major oil leaks from damaged pipelines could have irreversible impacts on the ocean environment," the researchers warn in their study.
The more TV parents watch, the more their children watch and are less active as a result, say the authors of a new study in BMC Public Health.
The study found that higher parental TV viewing was associated with an increased risk of high levels of TV viewing for both boys and girls. For girls, the relative risk of watching more than four hours of TV per day was 3.67 times higher if the girl's parent watched two-four hours of TV per day, when compared to girls who watched less than two hours of TV per day.
A study in Current Biology has confirmed that the brain chemical dopamine plays a role in decision making by influencing our expectations of the pleasure associated with the outcomes of our choices.
Dopamine's role in reward learning and reward-seeking behavior has been established in animals, said Tali Sharot of University College London. In humans, however, much less was known. Her team recently found that when we imagine future events, activity in a dopamine-laden part of the brain tracks people's estimates of the expected pleasure to be derived from those events. Based on these findings, the researchers suspected that they could alter people's expectations, and with them their choices, by manipulating dopamine levels in the subjects' brains.