|Picture Scramble # 75
||22 January 2001
Orion Nebula: The Jewel in the Sword
Orion the Hunter is perhaps the best known constellation in the
sky, well placed in the evening at this time of the year for
observers in both the northern and southern hemispheres.
Use the arrow keys to shift the image left, right, up or down.
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For astronomers, Orion is one of the most important constellations, as it contains one of
the nearest and most active stellar nurseries in the Milky Way, the galaxy in which we live.
Here tens of thousands of new stars have formed within the past ten million years
or so - a very short span of time in astronomical terms. For
comparison: our own Sun is now 4,600 million years old and has not yet reached
half-age. Reduced to a human time-scale, star formation in Orion would
have been going on for just one month as compared to the Sun's 40 years.
Just below Orion's belt, the hilt of his sword holds a great jewel in the sky,
the beautiful Orion Nebula. Bright enough to be seen with the naked eye, a
small telescope or even binoculars show the nebula to be a few tens of light-years'
wide complex of gas and dust, illuminated by several massive and hot
stars at its core, the famous Trapezium stars.
However, the heart of this nebula also conceals a secret from the casual observer.
There are in fact about one thousand very young stars about one
million years old within the so-called Trapezium Cluster, crowded into a space
less than the distance between the Sun and its nearest neighbour stars.
This newly released photo of the Orion Nebula was obtained from the
Observatory. Additional information can be obtained from this web site.