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# REDIRECT Polar mesospheric clouds
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# and Polar
All four Circle_of_latitude # Major_circles_of_latitude | major circles of latitude that are defined by the Earth's tilt ( both Circle_of_latitude # Tropical_Circles | Tropical Circles and both Circle_of_latitude # Polar_Circles | Polar Circles ) will shift correspondingly.
# Polar mesospheric summer echoes ( PMSE ) have been studied, probing the mesosphere using the IRI as a powerful radar, and with a 28 MHz radar, and two VHF radars at 49 MHz and 139 MHz.
Polar Boy and Night Girl appear in one panel of Legionnaires # 49, concluding that their unseen team is not ready to aid the Legion against Mordru ( Night Girl calls them a " poor substitute ").
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