Galaxy NGC 2775: Spiral, elliptical or neither? | Hubble Space Telescope

Galaxy NGC 2775: Spiral, elliptical or neither? | Hubble Space Telescope

This NASA/European Space Agency Hubble Space Telescope picture features a galaxy that is challenging to categorize. The galaxy in question is NGC 2775. It lies 67 million light-years away in the constellation Cancer (The Crab). NGC 2775 sports a smooth, featureless center that is devoid of gas, resembling an elliptical galaxy. It also has a dusty ring with patchy star clusters, like a spiral galaxy. 

Is it spiral or elliptical—or neither?

Since we can only view NGC 2775 from one angle, it is difficult to say for certain. Researchers have classified NGC 2775 as a spiral galaxy because of its feathery ring of stars and dust and as a lenticular galaxy. Lenticular galaxies have features common to spiral and elliptical galaxies.

It is not yet known exactly how lenticular galaxies come to be. They can form in a variety of ways. Lenticular galaxies might be spiral galaxies that have merged with other galaxies, or that have mostly run out of star-forming gas and lost their prominent spiral arms. They also might have started out more similar to elliptical galaxies, then collected gas into a disk around them.

Evidence suggests that NGC 2775 has merged with other galaxies in the past. Invisible in this Hubble image, NGC 2775 has a tail of hydrogen gas that stretches almost 100,000 light-years around the galaxy. This faint tail could be the remnant of one or more galaxies that wandered too close to NGC 2775 before being stretched apart and absorbed. If NGC 2775 merged with other galaxies in the past, it could explain the galaxy’s strange appearance today.

A Hubble image of NGC 2775 was previously released in 2020. The new version adds observations of a specific wavelength of red light that is emitted by clouds of hydrogen gas surrounding massive young stars.

Image Description: A galaxy seen face-on with a slightly elliptical disc that appears to have a hole in the center like a doughnut. In the hole, the core is a brightly glowing point that shines light out beyond the edge of the disc. Around the hole is an inner ring of dust, and at the galaxy’s edge is a thicker outer ring of dust, with a swirling web of dust strands in between. Blue stars and red nebulae are visible behind the dust.

Credit: ESA/Hubble & NASA, F. Belfiore, J. Lee and the PHANGS-HST Team
Release Date: Sept. 22, 2025

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