There’s overwhelming evidence that Mars was once wet and warm. Rivers flowed across its surface and carved intricate channel systems revealed by our orbiters. Expansive oceans even larger than Earth’s may have covered a third of its surface. Then something happened: Mars lost its atmosphere, cooled down, and surface water disappeared.Continue reading “Early Mars Climate was Complex, with Streams Flowing Intermittently for Millions of Years”
We are once again indebted to Kevin M. Gill, a science data visualization artist with a flair for the cosmos, for this beautiful rendering! The image first popped up on Kevin’s Twitter feed last week and can also be found (and downloaded) on his Flickr account. As he explained, the visual is his rendition of what the Hypanis Valles on Mars may have looked like back when water still flowed in the region. As he described it:
Continue reading “A Real River Valley on Mars, Filled With Virtual Water by @Kevinmgill”
“A meandering river? Obvious and bad CGI? Based on a real place on Mars? All Three! Outflow location at Hypanis Valles With Flowing Water, via @HiRISE DTM data.”
From some viewpoints, Mars is kind of like a skeleton of Earth. We can see that it had volcanoes, oceans, and rivers, but the volcanoes no longer fume and the water is all gone. A new image from the ESA’s Mars Express drives the point home.Continue reading “This Dried Up Riverbed Shows that Water Once Flowed on the Surface of Mars”
The ancient climate of Mars is a mystery to scientists. Even with all we’ve learned about Mars, it’s still difficult to explain how lakes and rivers existed. A new study shows that Martian rivers were swollen with runoff and that they flowed far later into the planet’s history than previously thought.
The question is, how did the Martian climate create these conditions?Continue reading “Rivers on Mars Flowed for More Than a Billion Years”