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APOD: 2026 September 30 – Arp 78: Peculiar Galaxy in Aries

1 min read Picture A picture of the day. Rewritten in plain language

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  • Explanation: spiral galaxy Arp 78 is found within the boundaries of the head strong constellation Aries.
  • Tracking along dust lanes and lined with young blue star clusters, Arp 78's overdeveloped spiral arm is pumped-up by galactic-scale gravitational tides.
  • Embedded in faint star streams revealed in the deep telescopic exposure, NGC 770's fuzzy, elliptical appearance contrasts nicely with spiky foreground Milky Way stars.

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Explanation: spiral galaxy Arp 78 is found within the boundaries of the head strong constellation Aries. Some 100 million light-years beyond the stars and nebulae of our Milky Way galaxy, the island universe is a large 200,000 light-years across. Also known as NGC 772, it sports a prominent, outer spiral arm in this detailed cosmic portrait. Tracking along dust lanes and lined with young blue star clusters, Arp 78's overdeveloped spiral arm is pumped-up by galactic-scale gravitational tides. Interactions with its brightest companion galaxy, the more compact NGC 770 seen directly below the larger spiral, are likely responsible. Embedded in faint star streams revealed in the deep telescopic exposure, NGC 770's fuzzy, elliptical appearance contrasts nicely with spiky foreground Milky Way stars. APOD's email for image submissions has changed. Please see: APOD Submissions. Tomorrow's picture: a harvest

You are reading our version, not theirs. This is NASA's report with its verdicts and loaded words taken out. Plain description stays, and so do adjectives that carry a fact, such as "former" or "federal". The reporting, the facts and the quotations are theirs — quotations are never edited — and the indicators beside it measure this version. Hover or tap Adjectives to see every one left in the text.

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Outlet Niral ScoreAdjectivesSourcingSentimentHappiness
NASAas they published this story 23.2 15 10 -1.6 50
Mundane Readneutralized from NASA 17.6 15 10 -1.6 50

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