Earth Weather / Space Weather

Posted by: Susie77, 09:49 PM GMT del 10 Maggio 2013

Courtesy of Science @ NASA

May 10, 2013: Sunset is a special time of day. Low-hanging clouds glow vivid red and orange as the background sky turns cobalt blue. The first stars pop out in the heavenly dome overhead, eliciting wishes from backyard sky watchers.

The sunset of May 26th will be extra special. On that date, Venus, Jupiter and Mercury will gather in the fading twilight to form a bright triangle only three degrees wide.

Triple conjunctions of planets are fairly rare. The last time it happened was in May 2011, and it won't happen again until October 2015. This triple is especially good because it involves the three brightest planets in May's night sky: #1, Venus; #2, Jupiter; and #3, Mercury. The triangle will be visible even in places with heavy urban light pollution.

The best time to look is about 30 to 60 minutes after sunset. The three planets will be hugging the horizon, so a clear view of the western sky is essential.
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Let Venus be your guide. It pops out of the fading twilight long before the others. As soon as you locate Venus, look in that direction using binoculars. If your binoculars are typical, all three planets will fit in the eyepiece simultaneously. As the twilight continues to fade, set the optics aside; eventually the triangle will become visible to the naked eye.

You don't have to wait until May 26th to enjoy the show, however. The planets start gathering weeks earlier. Dates of special interest include:

May 11th through 13th, when the crescent Moon, Venus, and Jupiter form a long diagonal line jutting upward from the sunset;

May 23rd, when Jupiter and Venus converge to less than 5 degrees apart, close enough for simultaneous binocular viewing;

May 24th, when Mercury passes Venus less than 2 degrees away, giving shape to the triangle that reaches maximum compactness two nights later on May 26th.

The triangle begins to disperse on May 27th, but even then the show is not over. On May 28th, Venus passes Jupiter at a distance of 1 degree, forming a truly spectacular pair.

From beginning to end, the three naked-eye planets will be close enough to fit inside the field of ordinary binoculars from May 23rd until early June. May 26th is just the best among many very good nights.

Step outside, face west, and observe the planets. It's a beautiful way to end the day.

Credits:

Author: Dr. Tony Phillips | Production editor: Dr. Tony Phillips | Credit: Science@NASA

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Live Broadcast of Annular Solar Eclipse

Posted by: Susie77, 09:43 PM GMT del 09 Maggio 2013

RING OF FIRE SOLAR ECLIPSE--TODAY! On May 9-10, the Moon will pass directly in front of the sun over the South Pacific, producing a "ring of fire" solar eclipse. At greatest eclipse, more than 95% of the sun's surface will be covered. The Coca-Cola Space Science Center is hosting a live webcast of the event from Australia! Tune in on May 9th beginning at 5 pm EDT.

Courtesy of Space Weather.com

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Got Telescope?

Posted by: Susie77, 03:42 PM GMT del 25 Aprile 2013

Courtesy of Science @ NASA

See Saturn at its Best and Brightest

April 25, 2013: The Solar System is a beautiful place filled with wonders that NASA space probes are only beginning to discover. There's a tendency, though, for people to become indifferent; every year Hubble, Cassini, MESSENGER and other spacecraft beam back gigabytes of jaw-dropping images. After a while, you don't have any more "gasps" left in you.

Well, maybe just...

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Lyrid Meteor Shower Peaks Tonight (21 April 2013)

Posted by: Susie77, 12:20 AM GMT del 22 Aprile 2013

Courtesy of Space Weather

Every year in late April Earth passes through the dusty tail of Comet Thatcher (C/1861 G1), and the encounter causes a meteor shower--the Lyrids. This year the shower peaks on Monday morning, April 22nd. Forecasters expect 10 to 20 meteors per hour, although outbursts as high as 100 meteors per hour are possible.

Lyrid meteors appear to stream from the bright star Vega in the constellation Lyra:

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Requiem for a Lineman

Posted by: Susie77, 03:11 PM GMT del 13 Aprile 2013

[I wrote this on Thursday, in memory of my son-in-law's father, who was killed while repairing electrical service following the tornadoes in St. Louis on Wednesday evening.]

You were always on-call, day or night, no matter how horrible the weather. You were up on the pole before the rain even stopped, restoring power so we could have our boobtube and cell chargers and computers. When Katrina destroyed N.O., you left home and drove 900 miles and stayed for...

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