The Perseids start this week, and NASA calls it the best meteor shower of the year. Here's how to watch.

A meteor streaking across a small section of blue sky with stars and the tip of the sun in the lower-left corner visible.

A Perseid meteor streaks across the sky above Inspiration Point in Bryce Canyon National Park, Utah, on August 12, 2016. Ethan Miller/Getty Images

NASA calls the annual Perseids meteor shower the best of the year, thanks to the many bright meteors that streak across the night sky.

This year, the Perseids shower is predicted to peak on August 11 and 12, according to EarthSky. On those nights, people could see up to 100 meteors an hour as Earth plows through a cloud of cometary debris. That dwarfs the rate of meteors during all other annual showers.

The Perseids are active for about 40 days every summer – from July 14 to August 24 this year. So starting this week, there should be some meteor activity each night starting shortly after twilight.

The Perseid meteors are known for both their epic “fireballs” – explosions of light and color that last longer than those from typical meteors – and their long trails.

Here’s how to see the meteor shower.

No need for binoculars or telescopes

A meteor streaking across a dark-purple night sky above a house and a building illuminated in red.

The Perseids are especially visible in the Northern Hemisphere but can be glimpsed across the globe. To maximize your chance of seeing them, find a dark spot with a clear view of a cloudless, open sky. The area should be as far away from light sources as possible.

You can see the shower starting at about 9 p.m. local time. That’s just after twilight, when you can expect long-tailed meteors lower in the sky. The best time to see the show, however, is at about 2 a.m., since more meteors are visible in the predawn hours.

You can spot the Perseids with your naked eye – in fact, NASA recommends against using telescopes or binoculars, since these instruments show only a small part of the sky at a time and meteors can come from any direction.

It helps to set aside half an hour or so to let your eyes adjust to the dark, NASA says. Avoid looking at your phone, because the bright light from the screen can mess with your ability to see fainter meteors.

The Perseids meteor shower peaks around mid-August every year, but last year the moon was in its last quarter phase and rose just before the peak of the shower, so its brightness reduced the number of visible meteors.

This year, however, the crescent moon will be only about 13% illuminated by the sun on August 11 and 12. That should make it easier to see more meteors.

Where the Perseids come from

The annual shower gets its name from the constellation Perseus, which is where the meteors appear to originate in the sky.

A blue comet against a black night sky with many stars visible.

But Perseus isn’t really the source of the celestial light show. The Perseids happen when Earth’s orbit takes it through a lane of space debris left behind by the comet Swift-Tuttle. Bits of rocky debris the size of sand grains and peas slam into our atmosphere at 37 miles per second, or about 133,000 mph. As they burn up, they leave fiery streaks across the night sky.

It takes more than a month for Earth to pass through Swift-Tuttle’s wake, which is why the Perseids last so long. The meteor shower’s peak comes when our planet moves through the densest part of the comet’s debris trail.

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