Highest-resolution images ever captured of the sun’s surface

Original Article ↗ Hacker News Discussion ↗

Image access, resolution, and viewer UX

  • Official zoomable viewer is praised for content but criticized as slow, laggy, and “abysmal” compared to tools like Leaflet.
  • Some find the resolution underwhelming and want clear scale indicators (e.g., Earth overlays).
  • Others note very large downloadable JPEGs (~100 MB, up to 9600×9600 and ~99 MB versions) are available and better for close inspection.

Scale, distance, and irradiance

  • Confusion over distances: some mix up Earth–Sun distance (149M km), Solar Orbiter’s closest approach (43M km in comments vs 74M km in the ESA release).
  • Back-and-forth on solar irradiance: people compute power per square meter at the orbiter and at the Sun’s “surface,” emphasizing inverse-square scaling.
  • Clarification that ~17–20 kW/m² refers to flux at Solar Orbiter’s perihelion, not at the Sun’s surface.

Corona, temperature, and “surface”

  • Questions about why the corona is only visible in UV images even though it’s seen during eclipses.
  • Replies: the photosphere outshines the corona in visible light; during eclipses/coronagraphs the disk is blocked. Corona is much hotter and stands out more at shorter wavelengths.
  • Some note “surface” is a simplification for the photosphere.

Color, filters, and data products

  • Debate over whether the Sun is “white” vs yellow; consensus that the images are heavily filtered and/or colorized.
  • Detailed explanation that the “visible light” image is reconstructed from extremely narrowband filters around a specific iron absorption line; magnetic and velocity maps are derived via Zeeman and Doppler effects.
  • Some confusion over a “#” pattern on the disk; most attribute it to stitching artifacts.

Science vs art and alternative images

  • A popular composite “best-looking” Sun image is shared; debate arises about how much processing and “artistic freedom” disqualifies it as a “real photo.”
  • Many argue all astronomical images are processed; others stress the difference between outreach art and strictly scientific imagery.

Coverage, orbits, and future wishes

  • Discussion of Solar Orbiter’s eccentric, inclined orbit and use of Venus gravity assists; mention that a truly polar, highly inclined orbit was deemed too expensive.
  • Desire for continuous 360° solar coverage (like earlier STEREO era) and for high-res polar views; some question whether that would justify the cost.

Miscellaneous reactions and speculation

  • Numerous awe-filled comments about the Sun’s scale, power, and the small fraction of its output we feel on Earth; some reflect on ancient sun worship.
  • Speculation about hypothetical life inside stars or neutron stars, with SF references.
  • Some note the jagged solar limb and mosaic seams as either flaws or “authentic” scientific texture; others clean them up or blend visible/UV images for wallpapers and prints.
  • Brief side debates on terminology (“calculus” vs algebra, “resolution” being used loosely).