Halo over Kitt Peak National Observatory, Arizona, USA
Kitt Peak National Observatory
Kitt Peak National Observatory domes
Kitt Peak National Observatory dome
Kitt Peak Observatory
McMath-Pierce Solar Telescope, Arizona, USA
McGraw-Hill Telescope interior, Arizona, USA
WIYN 3.5-metre Telescope, Arizona, USA
Elephant's Trunk Nebula, optical image
Supernova remnant G70.5+1.9, optical image
Star trails over Mayall 4-metre telescope at KPNO
WIYN 0.9-metre telescope at KPNO
Mayall 4-metre telescope at KPNO
Galaxy cluster, composite image
Kitt Peak National Observatory, low angle view
Kitt Peak National Observatory telescopes
Evolution of Tucson city lights, 1959 to 2003
Hydra telescopic spectrograph device focal plane
Veil Nebula supernova remnant
Flaming Star Nebula
Open star cluster M39
Galaxy NGC 4753
Total lunar eclipse
WIYN 3.5-metre telescope dome at KPNO
Andromeda galaxy
McMath-Pierce Solar Telescope
Kitt Peak National Observatory during a lunar eclipse
Lunar halo, Chongqing, China
Lagoon Nebula
Lagoon Nebula, M8
Triangulum Galaxy
Solar halo
Jupiter's clouds, Juno image
Arizona Radio Observatory at night
Moon glory and Brocken spectre shadow
Moon halo and La Silla Observatory, Chile
Aurora borealis
Kitt Peak Public Observatory
Cirrus clouds
Nicholas U Mayall Telescope during a total lunar eclipse
Aurora australis, Antarctica
Lowell Observatory, Arizona, USA
Circumhorizontal arc over astronomy site
Lightning during desert storm
Moon surrounded by clouds
Moon halo above palm trees
Interesting cloud patterns over the Lake District, UK
Green Bank Telescope, USA
Aurora borealis in the night sky
Circumzenithal arc
Close-up of a parhelion
Supercell thunderstorm
Aurora Borealis, Lapland, Sweden
Very Large Array antennas, USA
Very Large Array antenna, USA
ALMA radio astronomy telescopes
Mount Wilson solar tower observation room
Mount Wilson solar observation towers
Very Large Array radio antenna
Star 51 Pegasi
Double Star Albireo
Variable Star Algol
Abell 85 supernova remnant
The Hercules Globular Cluster M13
Mizar and Alcor Star System
Mizar and Alcor Star System Close-up View
Polaris
Wide field view of the Antennae Galaxies
CTB 1 supernova remnant, composite image
Centre of Milky Way galaxy, VLA radio image
W50 supernova remnant, radio image
Abell 2744 galaxy cluster, radio image
Cumulus and cirrus clouds in a blue sky
Gemini North telescope, Hawaii
University of Hawaii & UKIRT telescope domes
Observatories at Mauna Kea, with comet Hale-Bopp
Keck I and II observatories on Mauna Kea, Hawaii
United Kingdom Infrared Telescope on Mauna Kea
Frank Drake, US astrophysicist
Otto Struve, Russian-US astronomer
Polishing radio telescope bearing
300-foot Green Bank radio telescope construction, 1961
300-foot Green Bank radio telescope, 1962
100-metre Green Bank Telescope
Green Bank Interferometer radio telescopes
Long Wavelength Array radio antennas
Gemini North and CFHT observatories, Mauna Kea, Hawaii
Banded airglow due to atmospheric gravity waves
Solar corona over the Himalayas
Airglow over Laigu Glacier
Neptune, Hubble Space Telescope image
Full Moon with corona
Sunset
Clouds at sunset over Yunnan Astronomical Observatory
Red sprites, Paranal Observatory, Chile
Milky Way over Kitt Peak Observatory, USA
Night sky over Kitt Peak Observatory, USA
Orion over Kitt Peak Observatory, USA
Microburst of wind
USA carbon dioxide urban emission
Lightning strikes, Arizona, USA
VISTA telescope
Spiral galaxy NGC 1097
Merged galaxies
Extrasolar planetary system, artwork
Free-floating planet, telescope image
Cirrus and stratus clouds.
ALMA radio astronomy observatory
La Silla Observatory, Chile
SPECULOOS Southern Observatory, Chile
Saturn's polar vortex
Colliding galaxies NGC 520
Stellar carbon monoxide, ALMA image
Cerro Tololo Inter-American Observatory
Paranal Observatory at sunset, Chile
Lovell radio telescope, Jodrell Bank Observatory, UK
Airglow above La Silla Observatory, Chile
Cerro Tololo Inter-American Observatory, Chile
McMath Solar Telescope at Kitt Peak
APEX telescope and ice penitentes
M78 reflection nebula
NGC 3324 star cluster, telescope image
Tarantula Nebula, telescope image
Frost-covered trees at dawn
Superior mirage, timelapse image
Explorer II high-altitude balloon
Lightning
Thunderstorm
Southern and northern hemisphere night skies, composite image
Wyoming Infrared Observatory
Quasar
Cederblad 214 Nebula
The Andromeda Galaxy
Orion Nebula, radio image
GK Persei nova remnant, composite image
Radar image of Mercury, 1991
Tatel radio telescope
Tatel radio telescope and US astrophysicist Frank Drake
Tatel Telescope under construction, 1958
Jansky radio antenna replica
Lloyd Berkner, founding acting director of NRAO
Tatel radio telescope control room, 1960s
McMath solar telescope, Kitt Peak
Rainbow
Cumulus clouds