Space clouds are glowing across the northern hemisphere, creating an ethereal spectacle visible even from the northern United States. These rare formations, known as noctilucent clouds, are the highest clouds in Earth's atmosphere and typically appear during summer months.
Noctilucent clouds are currently illuminating northern skies, offering a stunning display for observers in high-latitude regions. These 'space clouds' form about 50 miles above the Earth's surface in the mesosphere, where temperatures drop to minus 120 degrees Celsius. They are made of tiny ice crystals that reflect sunlight from below the horizon, creating their characteristic electric blue glow.
The phenomenon occurs when water vapor freezes onto meteor dust particles in the upper atmosphere. This year's display has been particularly bright, likely due to increased water vapor from rocket launches and climate change. Scientists from NASA and the University of Colorado have noted that noctilucent clouds have been appearing at lower latitudes in recent years, possibly linked to atmospheric changes.
Key details: The clouds are best seen during civil twilight, about 30-60 minutes after sunset or before sunrise. Optimal viewing locations include areas between 45 and 60 degrees north latitude, such as the northern U.S. states (Minnesota, Wisconsin, Michigan, and parts of New York), Canada, and northern Europe. The viewing window extends from May to August in the northern hemisphere. No special equipment is needed—just a clear view of the northern horizon.
According to atmospheric scientist Dr. Mark Hervig of GATS Inc., the brightness of this year's display correlates with increased solar activity and rocket exhaust water vapor. The International Space Station has also photographed these clouds from orbit, providing valuable data. Citizen science projects like the Noctilucent Cloud Observers' Network encourage public reporting to help track their frequency and distribution.
Analysis: The growing visibility of noctilucent clouds at lower latitudes signals potential shifts in the upper atmosphere. Climate models suggest that increasing greenhouse gases cool the mesosphere while warming the lower atmosphere, creating more favorable conditions for these clouds. This makes noctilucent clouds a potential indicator of climate change's reach into the upper atmosphere.
Outlook: The current display is expected to continue through mid-August. Enthusiasts should monitor local weather forecasts for clear skies and consider using noctilucent cloud tracking apps. Future research will focus on how space traffic and climate change affect these fragile formations. For now, this is a rare opportunity to witness a cosmic phenomenon from your backyard.
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Strange ‘Space Clouds’ Seen Glowing Across Northern Hemisphere
Bright noctilucent clouds are glowing across northern skies. Here’s what creates these rare space clouds and how to see them from the northern U.S.
Jamie Carter, Senior Contributor
Forbes
2 min read
5/10
Key Takeaways
- Noctilucent clouds form at an altitude of about 50 miles (80 km) in the mesosphere, the highest cloud formation in Earth's atmosphere.
- These clouds are visible only during summer months (May to August in the northern hemisphere) when the sun is slightly below the horizon.
- The ice crystals in noctilucent clouds measure less than 1 micrometer across, reflecting sunlight and creating a distinctive silver-blue glow.
- NASA's Aeronomy of Ice in the Mesosphere (AIM) satellite has tracked a significant increase in noctilucent cloud frequency and range since its launch in 2007.
- Climate scientists link the expanding presence of noctilucent clouds at lower latitudes (down to 45°N) to increased water vapor from rocket launches and global warming-induced cooling of the mesosphere.
Frequently Asked Questions
Noctilucent clouds, or 'space clouds,' are the highest clouds in Earth's atmosphere, forming about 50 miles above the surface in the mesosphere. They are made of tiny ice crystals that glow at twilight when sunlight reflects off them, appearing as electric blue or silver-white streaks in the sky.
Noctilucent clouds are visible from May to August in the northern hemisphere, typically between latitudes 45°N and 60°N. The best viewing times are 30 to 60 minutes after sunset or before sunrise, when the sun is just below the horizon. Viewers in northern U.S. states, Canada, and Europe have the best chances.
They are nicknamed 'space clouds' because they form at an extremely high altitude—nearly at the edge of space in the mesosphere. They are so high that they can reflect sunlight long after the ground is in darkness, making them appear as glowing formations against a dark sky.
Yes, scientists believe that increasing noctilucent cloud sightings at lower latitudes may be linked to climate change. As the mesosphere cools due to greenhouse gas trapping heat below, more water vapor freezes into ice crystals, creating more frequent and widespread noctilucent clouds.
Noctilucent clouds glow because of their extreme altitude. While the ground is dark, the upper atmosphere still catches sunlight. Tiny ice crystals in these clouds act like mirrors, scattering sunlight toward Earth and creating a striking blue-white luminescence.
Yes, modern smartphones with night mode or manual exposure settings can capture noctilucent clouds. For best results, use a tripod, set a long exposure (2–10 seconds), and keep the ISO low. Apps like NightCap can help with focus and stability.
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