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Prominent filaments

📷 Mark Johnston from Scottsdale, Arizona

A line of filaments march toward the limb of the Sun, which itself is bedecked with multiple prominences in this Hα image. Both phenomena are made of loops and tendrils of plasma that arch off the surface of the Sun; their varying appearance depends on the viewing geometry. The photographer is the author of the The Solar Observer’s Handbook, published this month.

June 2026 cover of Astronomy magazine, featuring an image of the cosmic web in purple, pink, yellow, and orange

June 2026

  • Untangling the cosmic web
  • Our planet’s electronic vulnerability
  • How to observe the night sky under city lights
  • Capturing the night sky in Kyrgyzstan

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