海角大神

Projected clear skies and low moonlight across much of the country Saturday night and Sunday morning will help fans of celestial phenomena witness a peak of whizzing visitors across the sky as part of the annual Orionid meteor shower.

Sky gazers can expect as many as 60 meteors an hour as the earth crashes into icy remnants abandoned by Halley鈥檚 Comet when it shot by the planet in 1986. The meteor shower will originate near the orange-glowing Betelgeuse star that makes up the right shoulder of Orion (The Hunter), most easily found by his conspicuous belt of stars.

The objects are boulders of ice and rock breaking into the atmosphere at about 148,000 miles per hour. Most sizzle and burn, creating 鈥渟hooting stars鈥� and even 鈥渆arthgrazers鈥� that span the sky. Larger chunks may actually explode into fireballs loud enough to hear down here on earth.

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(A large chunk of asteroid that entered the atmosphere and exploded just off the coast of northern California on Wednesday, in some cases shaking houses, was likely not part of the Orionids, NASA says.)

According to Weather.com, large sections of the Atlantic, the South, the Midwest, and Coastal West are likely to see crystal clear skies overnight. The moon has just begun to wax, meaning moonlight interference will be low.

Philosophers have long pondered the stars, but the Orionids usually inspire poetics even among the country鈥檚 most hardened space scientists. (For others who want to gush or chat, NASA will have its experts on hand starting Saturday night at this link.)

鈥淭he Orionid meteor shower isn鈥檛 the strongest, but it鈥檚 one of the most beautiful showers of the year,鈥� says Bill Cooke, head of NASA鈥檚 Meteoroid Environment Office.

Tony Phillips, who blogs at spaceweather.com, explains why in a NASA post.

鈥淭he shower is framed by some of the brightest stars and planets in the heavens,鈥� he writes. 鈥淐onstellations such as Taurus, Gemini, and Orion provide a glittering backdrop for the display. But that鈥檚 not all. This year, Venus and Jupiter have moved into position with Sirius, the Dog Star, to form a bright triangle in the eastern pre-dawn sky. On the morning of Oct 21st, blazing pieces of Halley鈥檚 Comet will cut straight through the heart of this celestial triad.鈥�

NASA has a few suggestions for how to optimize the show. The best display is likely to be two hours before sunrise, when Orion will be straight overhead. The meteors will burst from near Betelgeuse, but will spray across the entire sky. And remember: don鈥檛 blink.

鈥淏e prepared for speed,鈥� says Mr. Cooke, according to NASA. 鈥淥nly the November Leonids are faster.鈥�

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