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10x50 means 10 times magnification, things look 10 times closer, and 50mm objective lenses (the size where the light enters).
This size is hand-holdable, but quite powerful and gives a good bright view.
Pentax, Olympus, Nikon, Vanguard, Orion are all decent brands (I'm sure there are many other good brands too), decide on your budget and see what they have to offer in a 10x50 or similar size.
Google search for astronomy binocular reviews.
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