Tuesday, August 11, 2009

PERSEIDS

2009 Meteor Showers and Viewing Tips 

The next meteor shower is the Perseids on August 12, 2009. The shower peaks early afternoon on the 12th, so the morning of the 12th (midnight to dawn) and late evening are the best times to watch from the U.S.Name Date of Peak Moon Phase
Quadrantids January 3, morning First quarter
Lyrids night of April 21/22 near new Moon
Eta Aquarids May 5 Sets around 4 a.m.
Perseids August 12, morning/evening Rises around midnight
Orionids October 21, morning Near new Moon
Leonids night of November 17/18, morning New Moon
Geminids night of December 13/14 Near new Moon

Source:http://stardate.org/nightsky/meteors/

NOTES These are approximate times for the Lower 48 states; actual shower times can vary. Bright moonlight makes it difficult to see all but the brightest meteors.

What are meteor showers?

An increase in the number of meteors at a particular time of year is called a meteor shower. 

Comets shed the debris that becomes most meteor showers. As comets orbit the Sun, they shed an icy, dusty debris stream along the comet's orbit. If Earth travels through this stream, we will see a meteor shower. Depending on where Earth and the stream meet, meteors appear to fall from a particular place in the sky, maybe within the neighborhood of a constellation.

Meteor showers are named by the constellation from which meteors appear to fall, a spot in the sky astronomers call the radiant. For instance, the radiant for the Leonid meteor shower is located in the constellation Leo. The Perseid meteor shower is so named because meteors appear to fall from a point in the constellation Perseus.

What are shooting stars?

"Shooting stars" and "falling stars" are both names that people have used for many hundreds of years to describe meteors -- intense streaks of light across the night sky caused by small bits of interplanetary rock and debris called meteoroids crashing and burning high in Earth's upper atmosphere. Traveling at thousands of miles an hour, meteoroids quickly ignite in searing friction of the atmosphere, 30 to 80 miles above the ground. Almost all are destroyed in this process; the rare few that survive and hit the ground are known as meteorites.

When a meteor appears, it seems to "shoot" quickly across the sky, and its small size and intense brightness might make you think it is a star. If you're lucky enough to spot a meteorite (a meteor that makes it all the way to the ground), and see where it hits, it's easy to think you just saw a star "fall."

How can I best view a meteor shower?

If you live near a brightly lit city, drive away from the glow of city lights and toward the constellation from which the meteors will appear to radiate. 

For example, drive north to view the Leonids. Driving south may lead you to darker skies, but the glow will dominate the northern horizon, where Leo rises. Perseid meteors will appear to "rain" into the atmosphere from the constellation Perseus, which rises in the northeast around 11 p.m. in mid-August. 

After you've escaped the city glow, find a dark, secluded spot where oncoming car headlights will not periodically ruin your sensitive night vision. Look for state or city parks or other safe, dark sites. 

Once you have settled at your observing spot, lay back or position yourself so the horizon appears at the edge of your peripheral vision, with the stars and sky filling your field of view. Meteors will instantly grab your attention as they streak by. 

How do I know the sky is dark enough to see meteors?

If you can see each star of the Little Dipper, your eyes have "dark adapted," and your chosen site is probably dark enough. Under these conditions, you will see plenty of meteors. 

What should I pack for meteor watching?

Treat meteor watching like you would the 4th of July fireworks. Pack comfortable chairs, bug spray, food and drinks, blankets, plus a red-filtered flashlight for reading maps and charts without ruining your night vision. Binoculars are not necessary. Your eyes will do just fine.

Source:http://stardate.org/nightsky/meteors/

Monday, August 10, 2009

Deadly Doctors

BRIDGEVILLE, Pa. — Mary Primis had already taught several high-intensity fitness classes that day, putting dozens of students through their sweaty paces while barely breaking one herself.

As she kicked off the last class of the evening at a health club in the Pittsburgh suburbs — Latin impact dance aerobics — the 26-year-old Primis shared some big, happy news with the health-conscious women lined up in front of her: She was 10 weeks' pregnant with her first child.

Link:http://www.google.com/hostednews/ap/article/ALeqM5g1GQ8Cyh3ED0jLQz6JROvj2b7EbwD99USUAO2

It was 8 p.m. Tuesday, prime time for working out. The aerobics room at LA Fitness was packed with about 20 women. Among Primis' students that night were Heidi Overmier, a hardworking single mom; Betsy Gannon, an X-ray technician who loved walking her dog; and Jody Billingsley, who sold medical supplies and traveled to Tampa, Fla., this year to watch her beloved Pittsburgh Steelers win the Super Bowl.

A few minutes into the routine, a man in black workout clothes entered the room. None of the women paid any attention to him. It wasn't unusual for people to come in and out.

Then the man turned out the lights. He retrieved several guns from a duffel bag. Calmly, he opened fire on the class, spraying dozens of shots. Twelve women were hit.

As screams filled the darkened room, Primis lay in a pool of her own blood, wondering if she and her baby were going to make it. Nearby, two of the women were dead and a third mortally wounded.

The killer, 48-year-old loner George Sodini, didn't know his victims, but he knew their gender, and it was no accident that he chose this place and this time to commit murder. He was a failure with women, always had been. He wanted revenge; he'd make them pay attention.

His victims had been brought together Tuesday night by a passion for physical fitness. They were strong women, all of them. But they were no match for the gunman, who'd been plotting this rampage for at least a year.

They had a zest for living. His mantra, expressed in a Web diary: "Death Lives!"

Source:http://www.google.com/hostednews/ap/article/ALeqM5g1GQ8Cyh3ED0jLQz6JROvj2b7EbwD99USUAO2