Image: Geminid
Jimmy Westlake  /  Colorado Mountain College
A Geminid meteor streaks across the night sky, with circular star trails whirling the background, in a time-exposure photo made by astronomer Jimmy Westlake in December 1985.
By Senior science writer
updated 12/13/2007 4:25:06 PM ET 2007-12-13T21:25:06

Many meteor showers tend to disappoint, but the annual Geminid shower is relatively reliable. And this year's version, which peaks Thursday night, is expected to be a great one.

Meteors could start showing up anytime after dark, low on the eastern horizon. A better display should begin after 10 p.m. or so local time, when the constellation Gemini, from which the meteors appear to emanate, rises higher into the eastern sky.

By 2 a.m. local time Friday, Gemini is directly overhead, and meteors will streak outward in all directions like spokes on a wheel, weather permitting.

Forecasters predict one or two shooting stars per minute during the peak hours.

The Geminids will not put on anything like the dramatic meteor storms associated with the November Leonids several years ago, but the Geminids are known to be extremely reliable. Experts figure this year will be better than usual.

Seasoned skywatchers offer these tips:

  • Turn off all lights, indoors and out.
  • Dress warmer than you think necessary.
  • Give your eyes 15 minutes to adjust to the darkness.
  • Lie back on a lounge chair or blanket and scan as much of the sky as possible.
  • Don't use binoculars or telescopes — meteors move too fast.

"At first you might not see very many meteors — but be patient," said astronomer Bill Cooke of NASA's Marshall Space Flight Center in Alabama. "The show really heats up after midnight and by dawn on Friday."

Rural skywatchers could see up to 120 meteors per hour during this peak time. However, city lights will overpower most of the meteors. The best bet for urbanites is to leave town.

The moon is near its new phase, so skies will be dark. That's good, because darker skies mean more of the faint shooting stars are visible.

"It's always a great shower," Cooke said. "Don't miss it."

Meteor showers are generally caused by debris from a comet. The Geminids come, however, from an asteroid called 3200 Phaethon that scientists think might actually be a burned-out comet. Most of the shooting stars you'll see are created by bits of material the size of sand grains. As they streak through the atmosphere, they vaporize under the pressure.

While you're out, look for Mars. The Red Planet is starkly visible in the east by late evening and is high in the sky by midnight. It's easy to spot, appearing very bright and typically orange.

The Geminids will tail off rapidly after Friday morning, but a few stragglers, including perhaps some bright meteors, are likely to streak through the skies over the weekend.

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