Comet Starfish, Linckia multifora, Russell Islands, Solomon Islands

Starfish regenerate lost arms, Asteroidea, Triton Bay, West Papua, Indonesia

Comet NeoWise 2020 above Sullivan Butte in Chino Valley, with the Moon on the lower left and the Big Dipper in the center, Arizona, United States of America, North America

NeoWise Comet of 2020, which will not return for almost 7000 years according to NASA, Chino Valley, Arizona, United States of America, North America

Neowise comet before dawn, Emilia Romagna, Italy, Europe

Detail of Halley's comet seen as a bad omen in February 1066, Bayeux Tapestry, Bayeux, Normandy, France, Europe

Crowds point to Halley's Comet, February 1066, Bayeux Tapestry, Normandy, France, Europe

Comet star (Ophidiaster guildingii) and encrusting red sponges, Ilha Escalvada, Guarapari, Espirito Santo, Brazil, South America

Comet NEOWISE (C/2020 F3) over the still waters this night of Crawling Lake in southern Alberta. This was early in the evening with the sky still brightly coloured with twilight. The comet was in the southern part of Ursa Major between the pairs of stars called Tania and Talitha. The clouds that were present nicely framed the scene and reflected in the water as well. The comet was too high to be visible as a reflection at this time.

A telescopic closeup of Comet Lovejoy (C/2014 Q2) on January 19, 2015. I shot this from near Silver City, New Mexico, using a TMB 92mm apo refractor at f/4.4 and using a Canon 6D at ISO 1600 for a stack of 4 x 5 minute exposures. The ion tail is primarily from a single exposure to minimize blurring from the comet's motion relative to the stars. The rest of the image is from the stacked combination to minimize noise.

All of Scorpius, plus parts of Lupus and Ara regions of the southern Milky Way. This area was directly overhead when I took this at about 4:30 am local time on April 6, 2014 from near Coonabarabran, Australia. The head of Scorpius is at top his tail at bottom though you could turn this image any direction and it would be correct as seen in the sky at this latitude, depending on the time of night. But in portrait mode like this north is at top. Along the Milky Way are numerous nebulas, including the False Comet area, the Cat's Paw area, and the colourful nebulas around Antares at top. The dark Pipe Nebula is at left of frame.

Comet NEOWISE (C/2020 F3) reflected in the still waters this night of Crawling Lake in southern Alberta. A dim aurora at right colours the sky magenta. Lingering twilight colours the sky blue. A meteor or more likely a flaring satellite appears at right and is also reflected in the water. Even in this short exposure, the two tails ' dust and ion ' are visible. This was July 20, 2020.

This is Comet NEOWISE (C/2020 F3) over the Horseshoe Canyon formation near Drumheller, Alberta on the night iof July 10-11, 2020, taken about 2 a.m. MDT with the comet just past lower culmination with it circumpolar at this time. Warm light from the rising waning gibbous Moon provides the illumination. The comet's faint blue ion tail is just barely visible even in the moonlit sky and low altitude. The glow of summer perpetual twilight at latitude 51.5�8 N still colours the northern horizon despite this being close to the middle of the night.

Comet Hartley 2 near the Pacman Nebula, NGC 281, in Cassiopeia. Stack of 4 x 6 minute exposures at ISO 1600 with Canon 5D MkII on A&M 105mm apo refractor at f/4.8 with Borg reducer/flattener. Bright star is Alpha Cas, Schedar. Autoguided with Celestron NexGuide autoguider. However, image of comet core is from only one exposure to minimize trailing from this fast-moving comet.

Astronomer Vance Petriew at the eyepiece of his 20-inch Dobsonian reflector telescope, at the 2012 Saskatchewan Summer Star Party in Cypress Hills, SK. This is a single 20 second exposure with the Canon 5DMkII at ISO 4000, and 24mm Canon L-series lens at f/2. A faint aurora adds the horizon colours. The photo was taken on the occasion of the second return of Comet Petriew 185/P since its discovery 11 years earlier in 2001 at this very same location.

Comet NEOWISE (C/2020 F3) over some of the eroded hoodoo formations at Dinosaur Provincial Park, Alberta, July 14-15, 2020. A faint aurora is at right. The foreground is lit by starlight only; there was no light painting employed here.

Another incredible sky this night!

This is Comet NEOWISE (C/2020 F3) over Deadhorse Lake near Hussar in southern Alberta, taken just after midnight on July 10-11, 2020 during its evening appearance. The comet shines just above low noctilucent clouds. The slight wind ruffled the waters enough to prevent the clean reflection I was after.

Comet NEOWISE (C/2020 F3) with the Northern Lights over the Waterton River at Waterton Lakes National Park, Alberta, on July 13-14, 2020. This was from the Maskinonge picnic area.

The False Comet Cluster area of southern Scorpius, which includes the open cluster NGC 6231 and emission nebula IC 4628, and open cluster NGC 6242 at top. This is a superb binocular field.

Comet Lovejoy (C/2104 Q2) on the night of Dec. 27/28, 2014, as it was approaching the globular cluster M79 at upper right, in Lepus. This is a stack of 5 x 3 minute exposures at ISO 2500 with the Canon 5D MkII and TMB 92mm refractor at f/4.4. Taken from near Silver City, New Mexico.

Comet Holmes, 17P, taken Nov 1, 2007 on excellent night. Taken with A&M 105mm apo refractor at f/5 with Borg 0.85x compressor/field flattener on SkyWatcher HEQ5 mount. Canon 20Da camera at ISO400. Composite of 4 min, 2min, 1min, 30sec, 15sec, and 7 sec exposures, each exposure being a stack of 3 to 4 identical exposures. Registered and stacked in Photoshop (HDR mode did not produce usable result, so manually composited with sucessively smaller masks to reveal short exposure content around nucleus. Contrast exaggerated with Curves to bring out very faint tail structure. North up, so tail to the S and SW.Nucleus is dot at upper left of inner coma, other star in inner coma at right is a field star

Comet Hale-Bopp

A telescopic closeup of Comet Lovejoy (C/2014 Q2) on January 17, 2015, showing structure in the ion gas tail, in the form of streamers and discontinuities in the tail.

Landing Site on Comet 67P/C-G in Context

Comet fish

Rosetta And Philae Lander at Comet 67P/C-G

Rosetta Orbiter Deploys Lander to Comet 67P/C-G

Comet Churyumov-Gerasimenko

Comet Churyumov-Gerasimenko Outbursts

Comet ATLAS

Napa Valley Earthquake, 2014, Interferogram

Philae Lander Descending to Comet 67P/C-G

Comet 67P/Churyumov-Gerasimenko

Rosetta Lands on Comet 67/P Churyumov-Gerasimenko

Comet 67P/Churyumov-Gerasimenko

Comet Churyumov-Gerasimenko

Comet 67P/Churyumov-Gerasimenko

The Giotto Spacecraft

Sungrazing Comet ISON, C/2012 S1

Meteors burning through Mars atmosphere on a collision path concept panoramic

McNaught comet flying over the night sky, Patagonia, Argentina, South America

McNaught comet flying over the night sky, Patagonia, Argentina, South America

Ancient arch keystone decorated with the sketch of a church, a comet, the trigram CSA or CAS and the year 1669, Cittaducale, province of Rieti, Latium, Italy, Europe

Orange i can gen cloud background sky

Comet C/2020 F3, Neowise, next to Linden tree silhouette, Challhoechi, Basel-Landschaft, Switzerland, Europe

Christmas light, Piazza Braà, Verona, Veneto, Italy

Christmas light, Piazza Braà, Verona, Veneto, Italy

Comet, Calloplesiops altivelis, Maldives Island, Indian Ocean, Ari Atol