DSO = deep space object
FOV = field of view
M42 is one of a number of DSOs discovered by a gentleman called Charles Messier (hence the "M"). it is also called "orions nebula". the constellation orion rises in the east at night, you may know part of orion already as part is known as "the saucepan" or "pot". the nebula is in the handle of the pot and is one of the prettiest things you will see in the night sky.
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