วันอาทิตย์ที่ 26 มกราคม พ.ศ. 2568

What's the sunniest place on Earth?

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January 26, 2025

Original photo by craige bevil/ Alamy Stock Photo

There's a spot on Earth that's nearly as sunny as Venus.

Compared to other planets in our solar system, Earth is filled with impressive landscapes, including snow-capped peaks, lush rainforests, and vast oceans. But some places on our planet are so extreme, they're otherworldly — like Venus otherworldly. The Atacama Desert in Chile is one of the driest places in the world, so it makes sense that such a parched ecosystem would get its fair share of sun. But in the summer of 2023, scientists discovered that some parts of this immense plateau in fact get far more sunlight than any other place on Earth. While taking measurements of solar irradiance (light energy from the sun) on the Chajnantor plateau, researchers discovered — via a complex meteorological process known as "forward scattering" — that this area was nearly as sunny in summer as the surface of Venus.

Despite some key differences between the two planets, scientists often call Venus Earth's twin. Venus is roughly the same size as Earth, formed in the same area of the inner solar system, and is composed of much the same material — scientists even theorize that Venus was just like Earth some 3 billion years ago. But it is definitely not Earthlike now; it's a sweltering hell planet thanks to an atmosphere of thick carbon dioxide that traps all greenhouse gases. If you somehow found yourself on Venus, high levels of solar irradiance would be the least of your immediate worries, considering its surface temperatures of 900 degrees Fahrenheit and sulfuric acid-filled clouds. 

Venus is the only planet that spins clockwise.

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The brightest objects in the universe are called __.

Numbers Don't Lie

Distance (in miles) of Earth from Venus at its closest approach

23.6 million

Amount of rain (in millimeters) some areas of the Atacama Desert receive annually

5

Height (in feet) of the Atacama plateau's Nevado Ojos del Salado, the highest volcano in the world

22,608

Average width (in miles) of Chile, the world's narrowest country

108

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The world's largest telescope is being built in the Atacama Desert.

Low humidity, high altitudes, and zero light pollution make the Atacama Desert arguably the best place on Earth for stargazing, and astronomers around the world have used its unparalleled nighttime views to their advantage. The region is home to a variety of telescopes and surveys, including the Atacama Large Millimeter/submillimeter Array, the Cosmology Large Angular Scale Surveyor, and the Vera C. Rubin Observatory (previously the Large Synoptic Survey Telescope). The European Southern Observatory is also currently at work in the area building the largest telescope in the world, known (rather unimaginatively) as the Extremely Large Telescope (ELT). Just the main mirror of the telescope stretches 128 feet in diameter, which is three times larger than the current record holder, and that immense size will aid astronomers studying black holes and dark matter when ELT is ready to point its impressively huge eye skyward by the end of the decade.

Today's edition of Interesting Facts was written by Darren Orf and edited by Bess Lovejoy.

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