Hubble Spots Purple 'Jellyfish' Star Glowing in Abyss of Deep Space

In this new image from the Hubble Space Telescope, what looks like a top-down view of a jellyfish glowing in deep space is actually the planetary nebula NGC 2022. (Image credit: ESA/Hubble & NASA, R. Wade)

This stunning new photo from the Hubble Space Telescope appears to capture a cosmic jellyfish floating in space, but in reality this structure is no living creature.

Instead, this object — known as NGC 2022 — shows what happens when an old star, similar in size to the sun, grows old and casts off layers of gas. Astronomers call these objects planetary nebulas because in the first low-power telescopes of the 1600s and 1700s, they looked a bit like planets. Today, we know the term "planetary nebula" is a misnomer — this nebula or cloud of gas has nothing to do with planets.

Rather, NGC 2022 is a red giant star. That's the next stage of evolution after a sun-like star (a star between three and eight masses of the sun) finishes converting hydrogen into helium in its core using nuclear fusion. The two light atom types bond or fuse together,creating a heavier atom.

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Eventually, stars of this type run out of hydrogen in the core. Gravity squeezes the star and causes temperatures to rise during the contraction. Once the temperature soars high enough, it's possible for helium to fuse into carbon — and that causes the star to expand to a much larger radius than before. This newly expanded star, called a red giant, then sloughs off its outer layers of gas into space. 

"More than half of such a star's mass can be shed in this manner, forming a shell of surrounding gas," Hubble officials said in a statement. "At the same time, the star's core shrinks and grows hotter, emitting ultraviolet light that causes the expelled gases to glow." 

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The core of the star is visible in the center of the image, glowing a fierce yellow-orange. Its radiation lights up the surrounding clouds of gas, portrayed in much cooler wavelengths of pink and purple.

The sun is about 4.5 billion years old and roughly halfway through its phase of burning hydrogen into helium. When its red giant phase occurs, the sun is expected to engulf much of the inner solar system — possibly including the Earth. Either way, life is not expected to survive on our planet, but luckily, that's not expected to happen for about another 4.5 billion years. That's plenty of time for humans to figure out interstellar travel and find a new place to live.

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Elizabeth Howell
Staff Writer, Spaceflight

Elizabeth Howell, Ph.D., is a staff writer in the spaceflight channel since 2022. She was contributing writer for (opens in new tab) for 10 years before that, since 2012. Elizabeth's reporting includes an exclusive with Office of the Vice-President of the United States, speaking several times with the International Space Station, witnessing five human spaceflight launches on two continents, working inside a spacesuit, and participating in a simulated Mars mission. Her latest book, "Why Am I Taller?", is co-written with astronaut Dave Williams. Elizabeth holds a Ph.D. and M.Sc. in Space Studies from the University of North Dakota, a Bachelor of Journalism from Canada's Carleton University and (soon) a Bachelor of History from Athabasca University. Elizabeth is also a post-secondary instructor in communications and science since 2015. Elizabeth first got interested in space after watching the movie Apollo 13 in 1996, and still wants to be an astronaut someday. Mastodon: