An Atlantic Bottlenose Dolphin (Tursiops truncatus), Bahama Banks, Bahamas, Central America

A mother and juvenile Atlantic Bottlenose Dolphin (Tursiops truncatus), in the Bahama Banks, Bahamas, Central America

View along Flic en Flac Beach showing the clear shallows of the Indian Ocean, blue sky and white sand, on the west coast of Mauritius, Indian Ocean, Africa

Sunlight dances across a shallow, sandy slope off the island of Guadalcanal in the Solomon Islands.

Bright sunlight ripples across a shallow sand seafloor in the tropical Pacific Ocean.

Bright sunlight ripples across starfish on a shallow sand seafloor in the tropical Pacific Ocean.

A sleek blue shark (Prionace glauca) cruises through the cold waters off Cape Cod, Massachusetts, in the Atlantic Ocean. These beautiful elasmobranchs are found throughout the world in both temperate and tropical seas and are a species listed as Near Thre

A Florida manatee, Trichechus manatus latirostris, rises to the surface of Crystal River, Florida. This endangered sirenian subspecies migrates to inland rivers during the winter where water temperatures are warmer than the ocean.

A colorful West Indian starfish, Oreaster reticulatus, crawls over a shallow, sandy seafloor in Turneffe Atoll in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.

A colorful West Indian starfish, Oreaster reticulatus, crawls over a shallow, sandy seafloor in Turneffe Atoll in the Caribbean Sea. This reef is part of the massive Mesoamerican Reef System, the second largest barrier reef on Earth.

Curious young California sea lion (Zalophus californianus) with snorkeler underwater at Los Islotes, Baja California Sur, Mexico, North America

Almost total eclipse of the moon, Southern England, United Kingdom

Eclipse of moon, Southern England, United Kingdom

Red moon during eclipse, Southern England, United Kingdom

Jet stream winds over the Annapurna Himalayas with rainbow colours caused by refraction on ice crystals in the clouds, known as parhelion or sundog, Nepal, Asia

Jet stream winds over the Annapurna Himalayas with rainbow colours caused by refraction on ice crystals in the clouds, known as parhelion or sundog, Nepal, Asia

Jet stream winds over the Annapurna Himalayas with rainbow colours caused by refraction on ice crystals in the clouds, known as parhelion or sundog, Nepal, Asia

Rainbow over Bassenthwaite Lake in the Lake District, Cumbria, England, United Kingdom, Europe

A rainbow and shower over Fowey in Cornwall, England, United Kingdom, Europe

The Full Moon rising on December 22, 2018, the day after the winter solstice, in a perfectly clear sky and over the distant horizon to the northeast over the snow-covered prairie. Some cows are grazing at left! The top edge of the Moon has a green rim and the bottom edge a red rim, from atmospheric refraction. But it made for a Christmas-coloured Moon ornament on the horizon! The dark lunar mare and even the bright rays splashing from Tycho at bottom are visible.

Planthopper in Water Droplet

Water Droplet on the ISS

Using refractive telescope to select optical correction in spectacle lenses. Masked patient and doctor - Covid 19.

Using refractive telescope to select optical correction in spectacle lenses. Masked patient and doctor - Covid 19.

Ophthalmology office. Masked patient and doctor - Covid 19 in consultation. Refractive telescope, slit lamp, fundus, AMD, eye diabetes, retinal scanner, Volk lens, Cover test, glasses, blur. Old person.

Using refractive telescope to select optical correction in spectacle lenses. Masked patient and doctor - Covid 19.

Using refractive telescope to select optical correction in spectacle lenses. Masked patient and doctor - Covid 19.

Ophthalmology office. Refractometer, a device for measuring refractive indices. Masked patient and doctor - Covid 19.

Rainbow Toyabee National Forest NV USA

Sunburst Clouds

Sundog appearing in ice fog, rainbow colours, ice crystals, Yukon Territory, Canada

Water reflections

Close-up of water surface

Dew reflects light in the lawn, Astoria, Oregon, United States of America

Male Swimming Under Water In Pool, Akumal, Quintana Roo, Mexico

Close-up of purple starfish seen through crystal clear rippling water

Rainbow over the steppe, Mongolia, Mongolia

Froth and bubbles of air reflecting rainbow colours on the surface at Cannon Beach, Oregon, USAAstoria, Oregon, USA

A double rainbow in the sky arching over the land, Rainbow, Saskatchewan, Canada

Aerial view of a swimming pool with a paved edge and plants in a garden, Stanford, Western Cape, South Africa

Aerial view of a swimming pool with a decking edge and plants in a garden, Stanford, Western Cape, South Africa

Aerial view of a swimming pool with a paved edge and plants in a garden, Stanford, Western Cape, South Africa

Aerial view of a swimming pool with a paved edge and plants in a garden, Stanford, Western Cape, South Africa

Aerial view of a swimming pool with a paved edge and plants in a garden, Stanford, Western Cape, South Africa

rainbow over waterfall natural phenomenon daytime outdoors vertical format Victoria Falls Zimbabwe Africa

Clear blue water

Water patterns