<human>:  How can I photograph stars in a clear night sky?
<bot>: To photograph stars in a clear night sky, you need to find a location that is free from light pollution, set your camera up on a tripod, adjust the focus and ISO settings, and use the longest exposure time that your camera allows. You may also need to experiment with different lens apertures to get the effect you're looking for. It also helps to use a remote shutter release or timer to minimize camera shake.