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Residents in Singapore were treated to a truly unusual phenomenon, as a so-called fire rainbow lit up the sky in the city-state. NASA says that fire rainbows are actually called circumhorizon arcs, which are created by a unique set of circumstances. A spokesman said: “The sun must be at least 58 degrees high in a sky where cirrus clouds are present. Furthermore, the numerous, flat, hexagonal ice-crystals that compose the cirrus cloud must be aligned horizontally to properly refract sunlight like a single gigantic prism. Therefore, circumhorizon arcs are quite unusual to see.”

518794 the fire rainbow above singapore

Nature – Images

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Ancient Earthworks Resembling Stonehenge Discovered In Amazon Rainforest

Ancient indigenous people built hundreds of large and mysterious earthworks in the Amazon rainforest more than 2,000 years ago.

Researchers have discovered over 450 earthworks in the western Brazilian Amazon after flying drones over the area. The large geometrical geoglyphs in Acre, a state in northwestern Brazil within the Amazon rainforest, were built by indigenous people more than 2,000 years ago before the arrival of the Europeans.

Geoglyphs are large designs produced on the ground and are often formed by rocks or similarly durable elements of the landscape such as trees, gravel, earth, and stones.

The geoglyphs were hidden by trees for most of their history, but deforestation has eventually helped reveal their presence. The discovery provided evidence how the ancient people lived in the region prior to the arrival of European people.

Study researcher Jennifer Watling, from the University of Sao Paolo’s Museum of Archaeology and Ethnography, said that the fact the sites were hidden beneath mature rainforest for centuries challenges the notion that the Amazonian forests are pristine ecosystems.

Geoglyphs

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Swirling polar ice caps revealed on Mars

Mars is revealing itself not to be the featureless red wasteland scientists once thought it was. New images from the European Space Agency’s Mars Express mission have captured the delicate swirls of ice at the planet’s north pole.

The idea that Mars may be capable of harbouring life has fuelled the space industry’s obsession. There are currently eight operational missions to the Red Planet – a mix of orbital, lander and rover types.

Like Earth, both poles on Mars are permanently covered in frozen ice caps. In the winter months, the plummeting temperatures make it cold enough for 30 per cent of the carbon dioxide in the planet’s atmosphere to freeze, adding a layer of ice onto its poles.

Mars north pole

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2-Mile-Long Crack Opens in Arizona Desert

A gaping, 2-mile-long crack has opened in the barren earth in Arizona, and it will likely continue to grow, geologists say.

Recent footage from a flyover by an Arizona Geological Survey drone revealed the extent of the huge fissure in Pinal County, between Casa Grande and Tucson, showing the enormous gash splitting the barren land. The crack is so big that it dwarfs people walking along its edges.

The northern part of the fissure, which is older and partially filled in, is shallow, while the southern portion is tens of feet deep in some spots.

Water withdrawal, primarily for agriculture, is the culprit. As groundwater is pulled up, it leaves a void and the land above it subsides, leading to cracks. Arizona is full of these cracks. We see earth fissures forming around the margins of these subsidence areas and along mountain fronts within the subsidence areas.

Giant crack arizona depth

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Snow in the Sahara

Amateur photographer Karim Bouchetata says he took the incredible pictures of snow covering the sand in the small Saharan desert town of Ain Sefra, Algeria, on December 19. The unforgiving red dunes looked pristine and picturesque.

Reports suggest that it is only the second time in living memory that snow has fallen on this desert. The last record is for February 18, 1979, when the snow storm lasted just half an hour.

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A starkly beautiful aerial image shows a 70-mile-long crack in Antarctica’s Larsen C ice shelf. As of Nov. 10, it was 70 miles (112 km) long and more than 300 feet (91 meters) wide. The dark depths of the crack plunge down about a third of a mile (0.5 km), all the way through the ice to the ocean below.

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A new image reveals how water flows through every river basin in the United States.

The stunning visualization follows the path of blue gold throughout the country. Surprisingly, no area is too far from the path of water. For instance, the arid Southwest may go months without significant rainfall, yet most of the region is threaded by hundreds of rivers fanning out from the Upper and Lower Colorado Rivers.

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Nature – Images

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Strange hexagonal clouds spotted over the Bermuda Triangle called as “air bombs” by scientists have been dubbed as the root cause of all mysterious vanishing of planes and ships at the doomed patch in the Atlantic Ocean, surrounded by Florida, Bermuda, and Puerto Rico.

According to meteorologists, the hexagonal clouds can trigger 170mph hurricane-like force, capable of destroying planes and ships in no time. Air blasts running at a speed of 170 mph plus can sink ships and crash planes without a trace.

Hexagonal clouds over bermuda triangle