Why can’t I see anything using my 10 mm eyepiece that came with the telescope?

If you can’t see anything clearly through your telescope using the 10 mm eyepiece, try using the lower power 25 mm eyepiece instead.

Always start with the lowest power eyepiece (the one with the highest number in millimeters printed on it). It is much easier to focus and has a wider field of view making it easier to aim the telescope. Look through the eyepiece by placing your eye just behind it (not right against the lens). Now turn one of the two knobs (on the side or below the drawtube) until the object is in focus.

Even using a lower power eyepiece like the 25 mm, a view can be blurry because of the Earth’s atmosphere. Heat waves and high-altitude winds move air around and cause differing temperatures of air to mix. This makes the air act like a weak lens that interferes with the light from a planet or a star (defocuses). On nights that are like this, the situation will be worse when you magnify it at an even higher power eyepiece such as with the10 mm. 

Updated 12/23/13