Messier 100 (M 100) – Hubble Space Telescope Image

M 100, a spiral galaxy in the constellation Coma Berenices, fills this Hubble Space Telescope view with a luminous sweep of blue and orange. Its tightly glowing centre provides the visual anchor, while broad arms curl outwards into the surrounding blackness. The structure is not perfectly even: light gathers in knots and ridges, and the spiral appears more open and diffuse as it approaches the edges of the frame.

The palette gives the galaxy a striking internal rhythm. A yellow-white centre passes through warm orange and brown before meeting cooler blue across the arms. Dark lanes interrupt this radiance, separating brighter structures and lending the galaxy an almost layered appearance. Because no colour-processing information accompanies the supplied metadata, these colours are best appreciated as features of the finished astronomical image rather than interpreted as a natural-eye view or a map of particular physical constituents.

Classified as a spiral galaxy in the local Universe, M 100 is seen here not simply as a symmetrical diagram, but as an intricate assembly of luminous arcs, fine filaments and quieter outer regions. Hubble’s view brings that complexity into sharp relief.

A closer look

Near the centre, the brightest material is concentrated into a compact glow, crossed and encircled by subtle wisps of orange. Small blue points and short luminous streaks cluster around it, breaking the smooth spiral into a wealth of finer structures. The transition from the warm centre to the blue arms is gradual, allowing the eye to follow the galaxy’s curvature rather than encounter a hard boundary.

The upper arm is particularly intricate. Narrow blue filaments trace its turn through the frame, interspersed with shadowed pockets and muted grey-brown patches. Towards the upper-right edge, several faint points of light stand apart against the dark field. Along the lower-left side, by contrast, a broad area of near-black cuts closely against the luminous arm, making its irregular edge appear especially crisp.

Farther out, the spiral loses intensity. Blue traces become thinner and more widely dispersed until they merge with the background, while isolated flecks of light remain suspended beyond the brighter structure. On a large presentation, these delicate outer extensions balance the concentrated brilliance of the centre and reveal how much of the image’s character lies in its quieter margins.

Image details and provenance

• Subject: M 100
• Object type: Spiral galaxy
• Constellation: Coma Berenices
• Telescope: Hubble Space Telescope
• Original release date: 10 December 2018, 06:00
• Image credit: NASA, ESA

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