i wanted to buy a binocular for observing the sky instead of buying a telescope because i don't have enough money. so what do the numbers represent? for instance 10x25? thankyou

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New Tasco Hi Def Day Night Compact 20x21 DCF Binoculars Nature Birdwatching
New Tasco Hi Def Day Night Compact 20x21 DCF Binoculars Nature Birdwatching
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