The Little Ghost Nebula is a planetary nebula. Nothing to do with planets, but they looked like planets in 18th century telescopes.  Planetary nebulae form when a star like the Sun runs out of hydrogen and swells into a red giant, throwing off the outer layers of atmosphere.  This often happens fairly symmetrically.  (Image: Hubble Heritage Team)  ©Mona Evans, “Nebulae” http://www.bellaonline.com/articles/art43407.asp

The Little Ghost Nebula is a planetary nebula. Nothing to do with planets, but they looked like planets in 18th century telescopes. Planetary nebulae form when a star like the Sun runs out of hydrogen and swells into a red giant, throwing off the outer layers of atmosphere. This often happens fairly symmetrically. (Image: Hubble Heritage Team) ©Mona Evans, “Nebulae” http://www.bellaonline.com/articles/art43407.asp

(PHOTOGRAPH BY NASA'S GODDARD SPACE FLIG...

NASAの木星探査機ジュノー、まもなく木星に到達

The North American Nebula. This swirling landscape of stars is known as the North American nebula. In visible light, the region resembles North America, but in this new infrared view from NASA's Spitzer Space Telescope, the continent disappears.

The North American Nebula. This swirling landscape of stars is known as the North American nebula. In visible light, the region resembles North America, but in this new infrared view from NASA's Spitzer Space Telescope, the continent disappears.

The "Butterfly Nebula"

The Butterfly Nebula has the largest wingspan in the universe

IC 2118: The Witch Head Nebula.  This suggestively shaped reflection nebula is associated with the bright star Rigel in the constellation Orion.

IC 2118: The Witch Head Nebula. This suggestively shaped reflection nebula is associated with the bright star Rigel in the constellation Orion.

The Horsehead Nebula is a dark nebula in the constellation Orion. The nebula is located just to the south of the star Alnitak, which is farthest east on Orion's Belt, and is part of the much larger Orion Molecular Cloud Complex.

The Horsehead Nebula is a dark nebula in the constellation Orion. The nebula is located just to the south of the star Alnitak, which is farthest east on Orion's Belt, and is part of the much larger Orion Molecular Cloud Complex.

Orion in Gas, Dust, and Stars Explanation: The constellation of Orion holds much more than three stars in a row. A deep exposure shows everything from dark nebula to star clusters, all embedded in an extended patch of gaseous wisps in the greater Orion Molecular Cloud Complex. Image Credit & Copyright: Rogelio Bernal Andreo (Deep Sky Colors) apod.nasa.gov/...

Arte cósmico: Orión en todo su esplendor

Orion in Gas, Dust, and Stars Explanation: The constellation of Orion holds much more than three stars in a row. A deep exposure shows everything from dark nebula to star clusters, all embedded in an extended patch of gaseous wisps in the greater Orion Molecular Cloud Complex. Image Credit & Copyright: Rogelio Bernal Andreo (Deep Sky Colors) apod.nasa.gov/...

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