Astronomy Picture of the Day ·

Blue Arcs Toward Andromeda

The Astronomy Picture of the Day for August 4, 2025 is “Blue Arcs Toward Andromeda,” an image. The picture is copyrighted by its creator (Image Credit & Copyright: Ogle et al .). The original explanation runs about 150 words.

The Andromeda Galaxy is shown just right of center, while some unusual blue arcs appear to its left. Please see the explanation for more detailed information.
Credit: Image Credit & Copyright: Ogle et al . Copyrighted Shown from science.nasa.gov. Not hosted by OpenOrbit.

From the explanation

“What are these gigantic blue arcs near the Andromeda Galaxy (M31)? Discovered in 2022 by amateur astronomers, the faint arcs — dubbed SDSO 1 — span nearly the same angular size as M31 itself.”

— APOD editors, August 4, 2025

Read the full explanation on science.nasa.gov

At a glance

Date
August 4, 2025
Type
Image
Credit
Credit: Image Credit & Copyright: Ogle et al .
Copyright
Copyrighted by the credited creator. Ask the copyright holder before reusing it.
Explanation length
About 150 words

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Topics in this entry

Andromeda GalaxyNebulaeGalaxies

Topics are matched from words in the title and explanation.

On this day: August 4 in other years

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Source

Copy taken Oct 28, 2026, 2:39 AM EDT. The image and explanation belong to their creators. OpenOrbit is not affiliated with or endorsed by NASA.