Photo: Sulfur Dioxide Kept Ancient Mars Ocean Flowing



An atmosphere rich with sulfur dioxide may have acted like a greenhouse gas on early Mars—instead of carbon dioxide as was previously suspected, a new study says.

The hotter temperatures may have also sustained the planet's ancient ocean (depicted above).

Illustration courtesy NASA/Greg Shirah


NEWS FEEDS    After installing a news reader, click on this icon to download National Geographic News's XML/RSS feed. After installing a news reader, click on this icon to download National Geographic News's XML/RSS feed.

Get our news delivered directly to your desktop—free.
How to Use XML or RSS

ADVERTISEMENT

NATIONAL GEOGRAPHIC'S PHOTO OF THE DAY

50 Drives of a Lifetime

Listen to your favorite National Geographic news daily, anytime, anywhere from your mobile phone. No wires or syncing. Download Stitcher free today.