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I study the mesopause region of the atmosphere, the coldest place on earth. It is the transition region from a neutral atmosphere to space. For this reason, it has importance to both space physics and to climate research. It is where meteors burn up and spacecraft first experience turbulence upon re-entry to the earth's atmosphere. It is at the "end of the whip" for climate study, where effects in the lower atmosphere are greatly amplified (and, perhaps, inverted). Global tropospheric warming is expected to produce substantial global mesospheric cooling. Scientists have just begun exploring in detail this region once called the "ignorosphere". So we have a ways to go to catch up. Resonance lidars have made this work possible, and many of the most important developments were undertaken by the research group I was part of in the 1980s.