What's in the photo? A "sunglint" shining off the ocean and the island's lake
When was it taken? Jan. 8, 2023
The uniquely shaped landmass is Rennell Island (also known as Mugaba or Mu Nggava), one of the southernmost of the Solomon Islands — an archipelago nation of nearly 1,000 islands, atolls and reefs that lies between Australia, Papua New Guinea and Fiji. It is up to 50 miles (80 kilometers) long and 8 miles (13 km) across at its widest point.
In this photo, sunlight reflects off the surface of both the Pacific Ocean and Lake Tegano directly into the astronaut's camera, making the water appear metallic. This sunglint effect is the strongest on the lake's left side and a horseshoe-shaped bay on the island's bottom edge, because these areas are most sheltered from the wind and therefore have the stillest and most reflective surfaces, according to NASA's Earth Observatory.
Lake Tegano is the largest lake on any of the more than 20,000 islands in the Pacific Ocean. (Image credit: Wikimedia)
Sunglints are useful to scientists because they can help reveal hidden oceanographic features, such as subsurface currents, oil slicks and internal waves, which look like marks on a mirror when this phenomenon is ongoing. Sunglints can also occur on land when sunlight reflects off rivers or illuminates large lakes.
Rennell Island is an atoll, meaning it is built on top of the remains of an ancient coral reef, most likely left behind when another island sank into the sea long ago. Its highest point sits around 500 feet (150 meters) above the ocean surface, making it the tallest atoll in the world, according to Britannica.
Rennell Island is surrounded by a fringing coral reef that completely disappears in the sunglint photos. (Image credit: Wikimedia)The region surrounding Lake Tegano is a biodiversity hotspot and has been listed as a UNESCO World Heritage Site. This area, dubbed East Rennell, is home to more than 20 endemic bird species, as well as the Crocker's sea snake (Laticauda crockeri), which is vulnerable to extinction, according to the Earth Observatory.
See more Earth from space
A recent satellite photo captured a series of clouds sculpted by von Kármán vortices from a volcano on South Korea's Jeju Island. A giant multicolor plume, ejected by China's Yangtze River, is also visible in the image.
A 2021 satellite photo shows an unusual series of concentric cloud rings that appeared directly above an erupting volcano on La Palma in Spain's Canary Islands.
A recent satellite photo captured a gleaming halo of phytoplankton encircling the remote Chatham Islands. The stunning sight is the result of a hidden underwater structure, which has also helped kill hundreds of cetaceans.
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