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
McGraw-Hill Telescope interior, Arizona, USA
WIYN 3.5-metre Telescope, Arizona, USA
Kitt Peak National Observatory telescopes
McMath-Pierce Solar Telescope, Arizona, USA
Elephant's Trunk Nebula, optical image
Supernova remnant G70.5+1.9, optical image
Evolution of Tucson city lights, 1959 to 2003
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
WIYN 3.5-metre telescope dome at KPNO
Hydra telescopic spectrograph device focal plane
Veil Nebula supernova remnant
Kitt Peak National Observatory during a lunar eclipse
Flaming Star Nebula
Open star cluster M39
Galaxy NGC 4753
Total lunar eclipse
McMath-Pierce Solar Telescope
Andromeda galaxy
Lagoon Nebula
Lagoon Nebula, M8
Triangulum Galaxy
Arizona Radio Observatory at night
Lunar halo, Chongqing, China
Lightning during desert storm
Moon halo above palm trees
Nicholas U Mayall Telescope during a total lunar eclipse
Solar halo
Circumzenithal arc
Close-up of a parhelion
Circumhorizontal arc over astronomy site
Neptune, Hubble Space Telescope image
Jupiter's clouds, Juno image
Full Moon with corona
Sunset
Aurora borealis
Clouds at sunset over Yunnan Astronomical Observatory
Cirrus and stratus clouds.
Lightning strikes, Arizona, USA
Milky Way over Kitt Peak Observatory, USA
Night sky over Kitt Peak Observatory, USA
Orion over Kitt Peak Observatory, USA
Moon glory and Brocken spectre shadow
Kitt Peak Public Observatory
Lightning
Frost-covered trees at dawn
Cirrus clouds
Aurora australis, Antarctica
Banded airglow due to atmospheric gravity waves
Solar corona over the Himalayas
Airglow over Laigu Glacier
Thunderstorm
Thunderstorm over an old church, USA
Cloud iridescence over Yunnan Astronomical Observatory
Lowell Observatory, Arizona, USA
Cumulus and cirrus clouds in a blue sky
Uranus, Hubble Space Telescope image
McMath Solar Telescope at Kitt Peak
APEX telescope and ice penitentes
Moon halo and La Silla Observatory, Chile
Valley fog
McMath solar telescope, Kitt Peak
Aurora Borealis, Lapland, Sweden
Salt polygons, Arizona
Altocumulus undulatus clouds
Stormy sky
Tornado formation
Mesocyclone thunderstorm
Tornado
Dust devil, Arizona, USA
Jupiter, VISIR infrared image
Green Bank Telescope, USA
Moon surrounded by clouds
Red sprites, La Silla Observatory, Chile
Lightning strike, Arizona, USA
Interesting cloud patterns over the Lake District, UK
Stormy sky over plains
Sunlit storm clouds over plains
Supercell thunderstorm
Tornado over fields, USA
Saguaro cactus, Arizona, USA
Winter frost on holly leaf
Double rainbow
Brocken spectre
Thunderstorm over fields, USA
large saguaro cactus amidst trees, Saguaro National Monument, Arizona
New York Blue Gene supercomputer
Frost
Frost 'flowers' on window
Saguaro National Park Cactus Forest, Arizona, USA
Rainbow
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
Saguaro cactus in Saguaro National Park, Arizona, USA
Sun beams
Construction of the Multiple Mirror Telescope Observatory
Wind research
Ocotillo plant
Santa Rita prickly pear cactus
High-altitude clouds, satellite image
雲
Lacunosus variety of cirrus clouds in a deep blue sky
巻雲
Gemini North telescope, Hawaii
University of Hawaii & UKIRT telescope domes
GranTeCan telescope