Orion Nebula M42 - a complete guide

Facts about the Orion Nebula and images of the famous star-forming region.

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Published: October 16, 2023 at 12:38 pm

The Orion Nebula is one of the most famous deep-sky objects in astronomy and, at just 1,500 lightyears away, the closest major star-forming region to Earth.

The nebula is well-known among astronomers and astrophotographers for its distinctive shape, but you don't necessarily need a telescope to observe it.

The Orion Nebula resides within our Milky Way galaxy and is relatively close to Earth.

In fact even from a suburban location it can be possible to see the Orion Nebula in the night sky with the naked eye.

The Orion Nebula William Brown, Coarsegold, California, US, 4 February 2019 Equipment: Nikon D7500 DSLR camera, Explore Scientific ED80 triplet apo refractor.
The Orion Nebula by William Brown, Coarsegold, California, US, 4 February 2019. Equipment: Nikon D7500 DSLR camera, Explore Scientific ED80 triplet apo refractor.

The Orion Nebula is also known as M42, it being part of the famous Messier Catalogue of deep-sky objects complied by French comet hunter Charles Messier.

The nebula can be seen in the Orion constellation, forming part of the hunter's sword just south of the belt.

You can certainly spot Orion's Belt from residential locations within the UK, USA and across Europe: it's one of the easiest nebulae to locate and observe.

The Great Orion Nebula by Kees Scherer, Portugal. Equipment: Esprit 100 f5.5, QHY16200 CCD @ -20C
The Great Orion Nebula by Kees Scherer, Portugal. Equipment: Esprit 100 f5.5, QHY16200 CCD @ -20C

Like the constellation, the nebula is best seen in winter skies and is particularly well-placed in January in the northern hemisphere.

To find the Orion Nebula, follow these simple steps:

  • Locate the Orion constellation
  • Find the three stars in a row that make up its belt: Alnitak, Alnilam and Mintaka.
  • Look just below Orion's belt and you'll see a fuzzy patch.
  • This is the Orion Nebula.

See if you can get a closer look through binoculars or a small refractor telescope.

For more help, read our guide on the best targets to observe in the Orion constellation or read US astronomer Scott Levine's piece on Thanksgiving astronomy.

M42 The Orion Nebula Steve Komarek, Carlton, Nottingham, 11 and 22 November 2020. Equipment: Atik 490EX camera, Sky-Watcher Quattro-8CF Newtonian, Sky-Watcher EQ6-R Pro mount
M42 The Orion Nebula by Steve Komarek, Carlton, Nottingham, 11 and 22 November 2020. Equipment: Atik 490EX camera, Sky-Watcher Quattro-8CF Newtonian, Sky-Watcher EQ6-R Pro mount

What is the Orion Nebula?

The Orion Nebula is a gigantic cosmic cloud of dust and gas where numerous new stars are being formed.

Four prominent stars can be seen within the nebula, forming an asterism that's known as the Trapezium Cluster because the stars appear arranged in a trapezoid shape.

These powerful winter stars are unleashing streams of ultraviolet radiation that is sculpting a cavity in the nebula, destroying the gas and dust necessary for new stars to be born.

The Trapezium Cluster as seen in an infrared image captured by the Hubble Space Telescope. Credit: K.L. Luhman (Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.); and G. Schneider, E. Young, G. Rieke, A. Cotera, H. Chen, M. Rieke, R. Thompson (Steward Observatory, University of Arizona, Tucson, Ariz.) and NASA/ESA
The Trapezium Cluster as seen in an infrared image captured by the Hubble Space Telescope. Credit: K.L. Luhman (Harvard-Smithsonian Center for Astrophysics, Cambridge, Mass.); and G. Schneider, E. Young, G. Rieke, A. Cotera, H. Chen, M. Rieke, R. Thompson (Steward Observatory, University of Arizona, Tucson, Ariz.) and NASA/ESA

Hubble Space Telescope's view

The sharpest view ever taken of the Orion Nebula, 1,500 lightyears away, reveals over 3,000 stars of differing sizes nestling within the vast cavern of rolling dust and gas. Credit: NASA, ESA, M. Robberto ( Space Telescope Science Institute/ESA) and the Hubble Space Telescope Orion Treasury Project Team
The sharpest view ever taken of the Orion Nebula, 1,500 lightyears away, reveals over 3,000 stars of differing sizes nestling within the vast cavern of rolling dust and gas. Credit: NASA, ESA, M. Robberto ( Space Telescope Science Institute/ESA) and the Hubble Space Telescope Orion Treasury Project Team

The Orion Nebula has been photographed by many amateur and professional astronomers over the years, but some of the most famous images have been by the Hubble Space telescope.

In 2006 the Hubble team released the image above: the sharpest view of the nebula that had ever been captured at that time.

Hubble's image of the Orion Nebula revealed amazing detail in the dust lanes and newborn stars of this star-fomring region.

The telescope was able to pick out over 3,000 stars of different sizes.

The image also showed the bright central region and the nebula's four brightest stars, known as the Trapezium Cluster.

Below is a gallery of images of the Orion Nebula captured by astrophotographers and BBC Sky at Night Magazine readers from around the world.

For advice on photographing it yourself, read our guide to deep-sky astrophotography or our tutorial on how to photograph the Orion Nebula.

And if you do manage to capture it, be sure to send us your images or share them with us via Facebook, Twitter and Instagram.

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