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Scientists have spotted unexpected X- and C-shaped structures in the atmosphere. They are struggling to explain them

By Ashley Strickland, CNN (CNN) — Each day, radio signals from key communications and navigation satellites travel freely through a layer of Earth’s atmosphere known as the ionosphere. Floating 50 to 400 miles (80 to 643 kilometers) above our heads, directly beneath the lowest reaches of space where some communications satellites orbit, this zone in

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The discovery of a possible sign of life in Venus’ clouds sparked controversy. Now, scientists say they have more proof

By Jacopo Prisco, CNN (CNN) — Four years ago, the unexpected discovery in the clouds of Venus of a gas that on Earth signifies life — phosphine — faced controversy, earning rebukes in subsequent observations that failed to match its findings. Now, the same team behind that discovery has come back with more observations, presented

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Tigers are disappearing from Southeast Asia. A forest in Thailand is offering new hope

By Rebecca Cairns, CNN (CNN) — As Global Tiger Day rolls around, there’s good news for the big cats in Thailand. The tiger population in the country’s Western Forest Complex (WEFCOM) — an 18,000-square-kilometer (6,950-square-mile) area of forest encompassing 11 national parks and six wildlife sanctuaries — is estimated to have more than tripled between

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