Could this upper blue arm be gravitational lensing?

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It looks like star formation, maybe as a result of a flyby with another galaxy. There might be a few galaxy fragments above it.

Spiral galaxies are not massive enough to be gravitational lenses.
It looks like star formation to me.

Gravitational lenses are more obvious, and are usually blue or red.

Here is some info

Zooite Guide to Strong Gravitational Lenses Zooniverse

54 Strong Gravitational Lens candidates in DECaLS, the DESI DECam Legacy Survey

Amazing gravitational lens observed with HST

SpaceWarps: Education Zooniverse

SpaceWarps: Frequently Asked Questions Zooniverse

The story of a gravitational lens Zooniverse


Thank you so much Christine, these articles really gave a lot of insight! :grin:

Would you say this is gravitational lensing? The left blue shape

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I don’t normally associate spiral galaxies with g.lensing…I’d say it’s probably blue stars in that spiral arm, though it’s appearance is similar to a lensing event)

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You’re welcome

and more…

Galaxy Colour and Redshift Chart which shows what galaxies look like as we look further and further away, Click to get spectrum

Learn Astrophysics - redshift and spectral charts
Easy. Really.

Animations of galaxy formation and evolution

Ringed Galaxy Classification

SDSS tutorials for beginners (this is from another sky survey, but it is still useful)
Easy Basic Science Projects star color, charts
Advanced Advanced Science Projects Spectral types, Hertzsprung-Russell diagrams

**Redshift Gallery: Quasars ** Compare the spectra of quasars, from “close” to the edge of the Universe.

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Yes, you need galaxies about 1,000 times more massive than your average spiral to be able to lens visibly

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