Did you get a 2x or 3x Barlow with your package? Don't feel compelled to rush out and buy one before you have used your scope the first time, but if you have one, try it with the 10 mm eyepiece - but only after you are comfortable with using the 10 mm. It will double (or triple, if you have a 3x Barlow) the magnification, which will help with planetary observing, but it can also be "twice (three times) as tricky" to use comfortably.
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