A Cosmic Heart Where New Stars Thrive

A Cosmic Heart Where New Stars Thrive - Cocoon Nebula, IC 514
Credit: X-ray: NASA/CXC/SAO; Infrared: NASA/JPL/Caltech(WISE); Optical: M. Adler, B. Wilson; Image Processing: NASA/CXC/SAO/L. Frattare

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To celebrate Valentine's Day, we are releasing a new image of the Cocoon Nebula (officially named IC 5146). This heart-shaped nebula is a region in the Milky Way galaxy where new stars are forming. X-ray data from NASA’s Chandra X-ray Observatory (red, green, and blue) reveal a cluster of new stars that are just poking through the stunning nebula. Young stars, like those in the Cocoon Nebula, are very active and give off large amounts of X-rays that Chandra can detect.

The nebula itself glows from a combination of light that is emitted by the young stars as well as light that is reflected off the dust in the nebula. This composite image of the Cocoon Nebula contains an optical-light image (red, green, and blue) from astrophotographers Michael Adler and Barry Wilson, as well as infrared light data (red, yellow, and cyan) from NASA’s Wide-field Infrared Survey Explorer (WISE) mission.

The Cocoon Nebula is about 15 light-years across and is located about 2,650 light-years from Earth in the constellation of Cygnus.

NASA's Marshall Space Flight Center in Huntsville, Alabama, manages the Chandra program. The Smithsonian Astrophysical Observatory's Chandra X-ray Center controls science operations from Cambridge, Massachusetts, and flight operations from Burlington, Massachusetts.

Source: NASA’s Chandra X-ray Observatory

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Visual Description:

This image shows the Cocoon Nebula (IC 5146) as a glowing, heart-shaped cloud set against a dense backdrop of countless stars scattered across the Milky Way. The nebula's center is filled with warm reds, oranges, and golds, forming a luminous cocoon of gas and dust with soft, uneven edges that fade into the surrounding darkness.

Embedded within this glowing cloud are many young stars, some appearing as bright white or bluish points, while others are hidden and revealed only through X-ray light detected by NASA's Chandra X-ray Observatory. These X-rays trace a cluster of newly formed, highly active stars concentrated near the nebula's core.

The heart-shaped nebula itself shines through a mix of light emitted by these young stars and starlight reflected off surrounding dust. Optical data from two astrophotographers and infrared observations from NASA's Wide-field Infrared Survey Explorer provide depth and texture, revealing a sparkling star field and the thick, dusty structures where new stars continue to form.

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Fast Facts for IC 5146, Cocoon Nebula

Credit: X-ray: NASA/CXC/SAO; Infrared: NASA/JPL/Caltech(WISE); Optical: M. Adler, B. Wilson; Image Processing: NASA/CXC/SAO/L. Frattare
Release Date: February 12, 2026
Scale: Image is about 23 arcmin (17.7 light-years) across.
Category: Normal Stars & Star Clusters
Coordinates (J2000): RA 21h 53m 28.7s | Dec +47° 16´ 16.01"
Constellation: Cygnus
Observation Dates: 2 observations: Feb 22, 2006 and Feb 24, 2015
Observation Time: 17 hours 47 minutes
Obs. ID: 6401, 15723
Instrument: ACIS
Color Code: X-ray: red, green, and blue; Infrared: red, yellow, and cyan; Optical: red, green, and blue
Distance Estimate: 50 light-years from Earth

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Colossal Star Glows Through a Nebula Cloud

Cocoon Nebula Cloaks a Colossal Star Destined to Become a Black Hole
Image Credits: Jean-Charles Cuillandre (CFHT), Hawaiian Starlight, CFHT

The breathtakingly beautiful Cocoon Nebula is located about 4,000 light years away toward the constellation of Cygnus. Hidden inside the Cocoon is a newly developing open cluster of stars dominated by a massive star in the center of the above image that opened a hole in an existing molecular cloud through which much of the glowing material flows. The same star, which formed about 100,000 years ago, provides the energy source for much of the emitted and reflected light from this nebula.

Massive stars shine steadily until the hydrogen has fused to form helium ( it takes billions of years in a small star, but only millions in a massive star), when it becomes a red supergiant and starts off with a helium core surrounded by a shell of cooling, expanding gas. Over the next million years a series of nuclear reactions occur forming different elements in shells around the iron core. When the core collapses in less than a second, it causes an explosion called a Supernova, in which a shock wave blows of the outer layers of the star. If the core -between 1.5 - 3 solar masses- survives, it contracts to become a neutron star. If the core is much greater than 3 solar masses, the core contracts to become a black hole.

Source: The Daily Galaxy