Thursday, September 10, 2009

Astronomers on Centaurus galaxy

Astronomers said that Centaurus A a new found galaxy emits a radio glow covering an area about 200 times bigger than the full moon.

With the radio wave information, a team has formed the image of the galaxy which lies some 14 million light-years away, in the constellation and has a black hole that is 50 million times the mass of the Sun. This image will help the astronomers to understand about the evolution of galaxy and about black holes.

On this information Centaurus A is so big and bright galaxy and that no one would have ever tried making such an image.

The astronomers used CSIRO's Australia Compact Array telescope near Narrabri, NSW, to view the galaxy for more than 1200 hours, over several years and got 406 individual images, which were mosaic together to make one large image.

Centaurus A is the nearby of the galaxies with a big black hole producing radio glow, which makes it the easiest to study.

Thursday, September 03, 2009

Safe way to decrease weight

Weight cycling, or losing and regaining weight repeatedly, may increase the risk of developing gallstones.

You can take several measures to decrease the risk of developing gallstones during weight loss. Losing weight gradually, instead of losing a large amount of weight quickly, lowers your risk. Depending on your starting weight, experts recommend losing weight at the rate of 1/2 to 2 pounds per week. Losing weight at this rate commonly occurs for up to 6 months. After 6 months, weight loss usually declines and weight stabilizes because individuals in lower weight groups use fewer calories (energy). You can also decrease the risk of gallstones associated with weight cycling by aiming for a modest weight loss that you can maintain. Even a loss of 5 to 10 percent of body weight over a period of 6 months or more can improve the health of an adult who is overweight or obese.

Your food choices can also affect your gallstone risk. Experts recommend including some fat in your diet to stimulate gallbladder contracting and emptying. Current recommendations indicate that 20 to 35 percent of your total calories should come from fat. Studies have also shown that diets high in fiber and calcium may reduce the risk of gallstone development.
Finally, regular physical activity is related to a lower risk for gallstones. Aim for approximately 60 minutes of moderate- to vigorous-intensity activity on most days of the week to manage your body weight and prevent unhealthy weight gain. To sustain weight loss, engage in at least 60 to 90 minutes of daily moderate-intensity physical activity.