Noctilucent clouds images: a readers' gallery
We asked you to send us your best images of noctilucent clouds, and you didn't disappoint.
Noctilucent clouds are ethereal, silvery clouds that appear in the northern hemisphere throughout May until August.
The name means 'night-shining clouds' in Latin, and anyone who has witnessed these glowing features in the late evening or early morning sky will probably agree the term is apt.
Noctilucent clouds occur about 82km above sea level in Earth’s upper mesosphere and are created when the setting or rising Sun shines from below the visible horizon and hits newly-formed ice crystals.
Summer 2019 has seen some amazing displays, and we have already received a plethora of beautiful images from readers who've been able to spot and photograph them.
Some of our favourites appear in the gallery below.
If you do manage to capture any images of NLCs, we'd love to see them and may even add them to our gallery. Details are here.
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Iain Todd is BBC Sky at Night Magazine's Staff Writer. He fell in love with the night sky when he caught his first glimpse of Orion, aged 10.