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NightSky Friday: Top 10 Winter Sky Targets

By Joe Rao
SPACE.com's Night Sky Columnist
posted: 07:00 am ET
20 February 2004

#2: THE ANDROMEDA GALAXY

During the 10th Century, the Persian astronomer Al Sufi drew attention to an object amidst the stars, which we now call Andromeda, the Princess to a "Little Cloud." Even today, binoculars and telescopes reveal that "cloud" as little more than an elongated fuzzy patch, which gradually brightens in the center to a star-like nucleus.

The Andromeda galaxy is still about halfway up in the west-northwest sky, where you can seek out Al Sufi’s little cloud -- a small hazy spot if the night is perfectly clear and moonless. It is, in fact, the most distant object that the human eye can see without any optical aid.

Please forgive this patch of light for being so faint and tired looking. You will when you realize that, as you see it now, this light has been traveling at least 2,200,000 years to reach you, traveling all that time at the tremendous velocity of 671 million miles per hour. The light you are seeing is around 22,000 centuries old and began its journey around the time of the dawn of human consciousness.

When Andromeda's light began its nearly 13-quintillion-mile journey earthward, mastodons and saber-toothed tigers roamed much of pre-ice-age North America and prehistoric man struggled for existence in what is now the Olduvai Gorge of East Africa.

When you have finally located this "little cloud," it is hard to believe that it is actually made up of over 300 billion suns like the one we see every day. It is so distant that only the telescope and camera combined can show its true nature. Long-exposure photographs reveal it to be a whole universe of stars like our own galaxy.


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