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#🐾 The #Cepheus #Zoo

This #celestial field, located in the #constellation Cepheus, hosts three #nebulae with strikingly different characteristics — a true cosmic zoo where #interstellar matter reveals itself in multiple forms:

#🦇 The Flying #Bat Nebula

An emission nebula dominated by ionized hydrogen (H-alpha).

➡️ Its deep red glow marks regions where young, energetic stars excite surrounding gas.

#🦑 The Giant #Squid Nebula

Also an emission nebula, but rich in ionized oxygen (OIII).

➡️ Its vivid #cyan color gives it an almost #ethereal appearance, shaped by very different physical conditions within the same star field.

#🐴 The #Seahorse Nebula

A dark nebula.

➡️ It doesn’t emit light — it blocks it. Its shape emerges by absorbing the bright background behind it, forming a perfectly sculpted cosmic silhouette.

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#✨ What makes this image remarkable

•	Three distinct #astrophysical processes captured in a single frame

•	A natural #contrast between #emission and #absorption

•	#Colors that come from real #physics not #artistic invention

📷 Pavel Vorobiev

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#Astronomy #Astrophotography #Cepheus #Nebula #DeepSky #OIII #HydrogenAlpha #Cosmos #Nostr #beautiful

You’re telling me there is something that looks like … okay #starfriends

🦑 What is the #Squid #Nebula (Ou4)?

•	Discovered in 2011 by French astrophotographer Nicolas Outters.

•	Nicknamed the “Squid Nebula” because of its striking, tentacle-like bipolar shape.

•	Officially cataloged as Ou4.

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🌌 Appearance

•	Appears in Earth’s night sky as a structure spanning 3 times the size of the full moon.

•	The glowing blue color comes from doubly ionized oxygen (OIII) atoms.

•	Surrounded by a larger red emission nebula, Sh2-129 (sometimes called the “Flying Bat Nebula”).

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📏 Size & Distance • Estimated to be around 2,300 light years away, located inside Sh2-129.

•	If this estimate is correct, Ou4 spans a staggering 50 light years across — making it one of the largest known outflows of its kind.

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🌟 Power Source • Likely powered by a triple system of massive, hot stars known as HR 8119.

•	These stars, located at the nebula’s center, may drive the outflow of matter that forms the squid shape.

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🔭 Scientific Importance • The Squid Nebula is unusual because it was discovered relatively recently by an amateur astrophotographer, not a major survey telescope.

•	Its origin is still not fully understood:

•	Is it a planetary nebula? (from a dying star)

•	Or a giant outflow linked to massive star winds or interactions?

•	Further spectroscopy and distance measurements are ongoing to confirm its nature.

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📸 Credits

•	The striking image of Ou4 was captured by #Alex #Linde


•	It combines multiple filters to isolate the light from hydrogen and oxygen emissions, highlighting the squid-like form.

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✨ Hashtags for Sharing

#Astronomy #Astrophotography #SquidNebula #Nebula #Stars #Cosmos