Monday, February 16, 2009

Galaxy has 'billions of Earths'

There could be one hundred billion Earth-like planets in our galaxy, a US conference has heard.

Dr Alan Boss of the Carnegie Institution of Science said many of these worlds could be inhabited by simple lifeforms.

He was speaking at the annual meeting of the American Association for the Advancement of Science in Chicago.

So far, telescopes have been able to detect just over 300 planets outside our Solar System.

Very few of these would be capable of supporting life, however. Most are gas giants like our Jupiter, and many orbit so close to their parent stars that any microbes would have to survive roasting temperatures.

But, based on the limited numbers of planets found so far, Dr Boss has estimated that each Sun-like star has on average one "Earth-like" planet.


This simple calculation means there would be huge numbers capable of supporting life.

"Not only are they probably habitable but they probably are also going to be inhabited," Dr Boss told BBC News. "But I think that most likely the nearby 'Earths' are going to be inhabited with things which are perhaps more common to what Earth was like three or four billion years ago." That means bacterial lifeforms.

Dr Boss estimates that Nasa's Kepler mission, due for launch in March, should begin finding some of these Earth-like planets within the next few years.

Recent work at Edinburgh University tried to quantify how many intelligent civilisations might be out there. The research suggested there could be thousands of them.

Source: http://news.bbc.co.uk/2/hi/science/nature/7891132.stm

Thursday, February 5, 2009

Blue the hue of creativity? Red for detail?

WASHINGTON – We learn from toddlerhood that red means danger — so should we use red ink for medication warnings? And if blue signals the freedom of open skies, how about brainstorming in a room painted blue?

Maybe so, says new research into how the brain reacts to colors: Red seems to improve attention to detail while blue sparks creativity.

"People are not aware of this effect at all," marvels lead researcher Juliet Zhu of the University of British Columbia, who studies how environmental cues affect behavior.

The subconscious effect of color is a hot area of psychology research, in part because marketers try to use color to hook us on whatever they're trying to sell.

And the newest research, published Thursday by the journal Science, suggests they'd better be careful — because red or blue can spark very different brain reactions depending on the task involved.

The study put college students through a series of cognitive tests, most involving computer screens colored either red or blue. Both colors could enhance performance but in very different ways.

Students memorized more words when the list was on a red screen, for instance. Told to think of different uses for a brick, those shown a red screen listed practical things like "build a house" while those who saw blue got more creative with "make a paperweight' and "build a pet scratching post."

When they rated ads, those who saw red backgrounds focused on what to avoid — they liked toothpaste that stressed cavity-fighting over tooth-whitening — while those who saw blue went for the creativity of a camera ad that showed travel images instead of touting the zoom lens.

Because we learn early that red means to avoid danger, maybe it's slowing us down in detail-oriented tasks so we can do them better — things like memorizing, proofreading, reading warning labels, concluded Zhu, an assistant marketing professor, and co-author Ravi Mehta.

But people associate blue with sky, freedom, peace, maybe sparking a feeling of exploration than in turn enhances creativity.

"It's really this learned association with these colors that drive these different motivations," Zhu said.

If the findings are right, the creativity discovery could be a big advance — no one's ever made such a link, said Andrew Elliot of the University of Rochester, a leader in the field of color psychology.

But he had a big caution: The study focused on hue without properly taking into account the intensity and brightness of the colors, meaning it should be repeated to be sure.

Most color research has focused on red, finding, for example, that it makes good sports uniforms because it's intimidating. Elliot found red is truly a good Valentine's color, making men consider women more sexually attractive than other colors do.

But how the brain reacts depends on the question you ask, Elliot said. When he flashed red at students before an IQ test or exam he found it undermines performance, maybe making them think of the failure that a teacher's red pen marks evoke.

That doesn't contradict Zhu's results, Elliot cautioned — proofreading or memorizing is more detail-oriented than a big exam.

The bottom line: "What color research shows is our behavior is driven by things we aren't aware of, by things we see on a regular basis," he said. "It's important to know, so when one sees red one can maybe try to counteract the natural tendency to make mistakes and fail."

Source: http://news.yahoo.com/s/ap/20090205/ap_on_sc/med_color_psychology