Methane on Mars
There’s a methane mystery brewing on Mars.

Scientists first detected traces of methane gas on Mars years ago, and it was exciting because the compound is a sign of life here on Earth. But a European orbiter has yet to find any evidence of methane in the planet’s atmosphere, despite being expressly made for the purpose. It’s complicating scientists’ search for life on the Red Planet.

Traces of methane were first detected in Mars’ atmosphere by the European Space Agenc