The comet won't return for another thirty-five years.
Twice each year, Earth passes through the ancient debris trail of Halley's Comet, and this week Arizona finds itself inside that corridor. The Eta Aquarids meteor shower peaks on the nights of May 5 and 6, offering residents a fleeting encounter with material shed by a comet that last graced human eyes in 1986 and won't return until 2061. A bright waning moon and the narrow window between midnight and dawn remind us that celestial spectacle, like most things worth witnessing, asks something of us in return.
- Earth is threading through the densest part of Halley's Comet debris right now — a two-night window that won't repeat for another year.
- A waning gibbous moon, still swollen from the May 1 Flower Moon, threatens to drown out the fainter meteors and cut visible counts significantly.
- Arizona's National Weather Service is forecasting mostly clear skies for both peak nights, offering cautious optimism to skywatchers across the state.
- The meteors appear as low, slow-burning 'earthgrazers' from Northern Hemisphere latitudes — long luminous streaks skimming the horizon at forty miles per second.
- Arizona's twenty-two designated dark sky locations — from the Grand Canyon to Flagstaff to Bisbee — give residents real options for escaping light pollution before the window closes at dawn.
For two nights this week, the skies over Arizona will carry the dust of Halley's Comet. The Eta Aquarids meteor shower peaks May 5 and 6 as Earth moves through the densest part of the debris trail the comet leaves along its long orbit. Halley itself won't be visible again until 2061 — it last appeared in 1986 — but its presence is felt twice yearly: in May through the Aquarids, and in October through the Orionids.
From Arizona and the broader Northern Hemisphere, viewers can expect ten to thirty meteors per hour. The Southern Hemisphere gets the more dramatic show, with up to fifty per hour, but northern observers are treated to something distinctive: earthgrazers, long luminous streaks that appear to skim the horizon rather than arc overhead. Traveling at roughly forty miles per second, these meteors leave glowing trails that linger for several seconds — the kind of shooting stars people remember.
The viewing window is narrow. Aquarius doesn't rise high enough before midnight, and dawn erases the fainter streaks. Two complications loom: a waning gibbous moon, still nearly full, will wash out dimmer meteors on both nights, and cloud cover could close the curtain entirely. The National Weather Service is forecasting mostly clear skies across Arizona, though some areas carry higher cloud probabilities.
Arizona offers real advantages for those willing to seek them out. The state has twenty-two designated dark sky locations recognized for minimal light pollution — among them Flagstaff, the world's first International Dark Sky Place, the Grand Canyon, Sedona, Petrified Forest, and smaller communities like Bisbee and Tubac. Even Fountain Hills, on the edge of the Phoenix metro, holds dark sky status.
The shower technically runs through May 28, but the peak — Earth's passage through the thickest part of Halley's trail — lasts only these two nights. The instruction is simple: find dark ground, arrive after midnight, face east, and wait. The comet won't return for decades. Its dust is overhead for forty-eight hours.
For the next two nights, the sky over Arizona will fill with the debris of a comet that won't return for another thirty-five years. The Eta Aquarids meteor shower reaches its peak on May 5 and 6, as Earth passes through the densest concentration of dust and rock left behind by Halley's Comet during its long orbit around the sun. Halley itself won't be visible to the naked eye again until 2061—it last appeared in 1986—but its presence is felt twice yearly when our planet intersects with the trails it leaves. In May, we get the Aquarids. In October, we get the Orionids. Both are born from the same cosmic source.
Under ideal conditions, observers in the Northern Hemisphere can expect to see between ten and thirty meteors per hour streaking across the sky. In the Southern Hemisphere, where the constellation Aquarius sits higher overhead, the show is more dramatic—up to fifty per hour. But here in Arizona and across the north, the meteors appear as what NASA calls "earthgrazers," long luminous trails that seem to skim along the horizon rather than arc overhead. What makes them distinctive is their speed: the debris enters the atmosphere at roughly forty miles per second, fast enough to leave glowing trains that persist for several seconds, sometimes longer. These are the shooting stars people remember.
The timing matters. The best window for viewing opens at midnight and closes at dawn on both nights. Before midnight, the constellation Aquarius hasn't risen high enough. After sunrise, the sky's brightness drowns out the fainter streaks. This narrow band of hours is when the show happens. But two obstacles stand between Arizona skywatchers and a clear view. The first is the moon. A waning gibbous moon, still nearly full from the Flower Moon on May 1, will hang bright in the sky on both peak nights, washing out the fainter meteors and reducing the total count visible from the ground. The second is weather. Cloud cover can erase the view entirely. The National Weather Service forecast for Arizona shows mostly clear skies across the state for both nights, though some areas show higher cloud probabilities than others.
The good news is that Arizona has options. The state hosts twenty-two designated dark sky locations, places officially recognized by DarkSky International for their minimal light pollution and optimal viewing conditions. Flagstaff holds the distinction of being the world's first International Dark Sky Place, earning that designation in 2001. The Grand Canyon, one of the most remote stretches of the contiguous United States, offers some of the darkest skies on the continent. Sedona, Petrified Forest National Park, Saguaro National Park near Tucson, and Chiricahua National Monument in the southeast all qualify. Smaller towns like Bisbee, a historic mining community in Cochise County, and Tubac in the Santa Cruz Valley also appear on the list. Even Fountain Hills, situated at the edge of the Phoenix metro area, maintains dark sky status. For those willing to drive, the options range from high desert to mountain forest to remote canyon country.
The Eta Aquarids meteor shower technically runs from April 19 through May 28, but the peak—the moment when Earth passes through the thickest part of Halley's debris trail—lasts only these two nights. After that, the show tapers. The meteors will still be visible, but fewer and farther between. For Arizona residents with clear skies and access to a dark location, the window is narrow and specific: find a spot away from city lights, arrive after midnight, look toward the eastern horizon where Aquarius rises, and wait. The comet that inspired these meteors won't return for decades. But its dust will be overhead for just forty-eight hours.
Citas Notables
In the Northern Hemisphere, Eta Aquarids meteors appear as 'earthgrazers'—long meteors that skim the surface of the Earth at the horizon.— NASA
La Conversación del Hearth Otra perspectiva de la historia
Why does Halley's Comet create two different meteor showers instead of just one?
Because Earth's orbit intersects the comet's debris trail at two different points in the year. Halley sheds ice and dust continuously as it orbits the sun. When we pass through one section of that trail in May, we get the Aquarids. When we pass through another section in October, we get the Orionids. Same source, different angles, different times.
You mentioned the moon will interfere. How much does that actually matter?
It matters enough to notice. A bright moon washes out the fainter meteors, so instead of seeing thirty per hour, you might see fifteen or twenty. The brightest ones will still cut through, but you lose the subtler display. It's not a deal-breaker, just a reduction.
What's an earthgrazer, exactly?
In the Southern Hemisphere, meteors arc across the sky overhead because Aquarius is high up. In the north, Aquarius stays low on the horizon, so the meteors appear to skim along the edge of the sky rather than plunge down from above. They're longer, more horizontal, more dramatic in their own way.
If someone lives in Phoenix, can they still see it?
Yes, but they need to drive out. Phoenix's light pollution will wash out most of the fainter meteors. But Fountain Hills, which is technically on the dark sky list, is close enough to reach in under an hour. Or drive further north to Flagstaff or the Grand Canyon. The farther from city lights, the better the show.
What happens after May 6?
The shower doesn't end, but it weakens significantly. The peak is these two nights because that's when Earth passes through the densest part of the debris trail. After that, the meteors thin out. You can still see them through the end of May, but the magic window closes.