Editing Lowell Observatory (section)

=== Notable Discoveries ===
{{see also|Category:Discoveries by the Lowell Observatory|Planets beyond Neptune}}
* The dwarf planet [[Pluto]] by [[Clyde Tombaugh]] in 1930
* Large [[recessional velocity|recessional velocities]] of [[galaxies]] by [[Vesto Melvin Slipher]] between 1912 and 1914 (that led ultimately to the realization our universe is expanding)
* Co-discovery of the [[rings of Uranus]] in 1977<ref>{{cite journal | bibcode=1977Natur.267..328E |journal=Nature |volume=267 |date=1977 |pages=328–330 |title=The rings of Uranus |doi=10.1038/267328a0 |last1=Elliot |first1=J  |last2=Dunham |first2=T |last3=Mink |first3=D |issue=5609 }}</ref>
* The periodic variation in the activity of [[Comet Halley]] during the 1985/1986 apparition<ref>{{cite journal | bibcode=1990AJ....100..896S |journal=Astronomical Journal |volume=100 |date=1990 |pages=896–912 |title= Periodic variations in the activity of Comet P/Halley during the 1985/1986 apparition |doi=10.1086/115570 |last1=Schleicher |first1=David G. |last2=Millis |first2=Robert L. |last3=Thompson |first3=Don T. |last4=Birch |first4=Peter V. |last5=Martin |first5=Ralph |last6=Tholen |first6=David J. |last7=Piscitelli |first7=Joseph R. |last8=Lark |first8=Neil L. |last9=Hammel |first9=Heidi B. |display-authors=5 }}</ref>
* The three largest known stars
* The atmosphere of [[Pluto]]
* Accurate orbits for two of Pluto's moons: [[Nix (moon)|Nix]] and [[Hydra (moon)|Hydra]]
* Oxygen on [[Jupiter]]'s satellite [[Ganymede (moon)|Ganymede]]
* [[Carbon dioxide ice]] on three Uranian satellites
* The first [[Neptune trojan|Trojan of Neptune]]
* Evidence that the atmosphere of [[HD 209458 b]] contains water vapor<ref>{{cite journal | bibcode=2007ApJ...661L.191B |journal=The Astrophysical Journal |volume=661 |date=2007 |pages=L191–L194 |title=Identification of Absorption Features in an Extrasolar Planet Atmosphere |doi=10.1086/518736 |last1=Barman |first1=Travis |issue=2 | authorlink= Travis Barman |arxiv=0704.1114 }}</ref>