Water Found on Exoplanets

NASA's Hubble Space Telescope has detected traces of the chemical signature of water in the atmospheres of five different exoplanets (WASP-17b, HD209458b, WASP-12b, WASP-19b and XO-1b) orbiting nearby stars.

Thinning Martian Atmosphere

NASA's Curiosity rover has found evidence of the heavier argon isotope Ar³⁸ in greater concentrations in the Martian atmosphere relative to the lighter Ar³⁶, supporting the theory that Mars' gravity is insufficient to prevent as much as 95% of its original atmosphere from escaping into space.

Cold Layer Around Venus

The European Space Agency's Venus Express has discovered an unexpected cold layer in Venus' atmosphere 77 miles above the planet's surface with temperatures reaching −283°F, much colder than anything in Earth's atmosphere and able to form carbon dioxide ice.