Is Mars home to an underwater lake? Different researchers are reaching different conclusions. Some say remote sensing from the Mars Express orbiter shows liquid water in an underground lake at Mars’ south polar region. Other researchers say clays or minerals explain the data better.
Who’s right? Maybe none of them.
A new study says that volcanic rock can explain the Mars Express data and that it’s a more plausible explanation.
Sometimes even forgotten pieces of technology can lead to completely new science. That was the case recently when scientists at the University of the Basque Country used an almost forgotten camera on the Mars Express to take a breathtaking video of a recurring cloud on the top of Arsia Mons.
A new image from the ESA’s Mars Express spacecraft shows how beautiful, and desolate, Mars can appear. It also highlights some of the natural process that shape the planet’s surface. The image is of the northern polar region, and it features bright patches of ice, deep dark troughs, and evidence of storms and strong winds.
The ESA’s Mars Express Orbiter is no stranger to the Martian moon Phobos. The spacecraft was launched in June 2003 and has been in orbit around Mars for 16 years. During its long time at Mars, it’s captured detailed images of Phobos, and helped unlocked some of that Moon’s secrets.
In a new sequence of 41 images captured during a recent fly-by, the Mars Express’ High Resolution Stereo Camera imaged Phobos from different angles, capturing images of the moon’s surface features, including the Stickney crater.
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.
It’s easy to take for granted the detailed, almost real-time knowledge of Mars that we have at our fingertips. After all, in the not-too-distant past, Mars was largely mysterious. All we had were ground-based images of the planet. Now? Now we have daily weather reports and images of dust storms.
Billions of years ago, Mars was likely a much warmer and wetter place than the cold, dry, barren world we see today. Whether there was life there or not remains an open question. But there’s a massive, growing wall of evidence showing that Mars may have had the necessary conditions for life in the past, including at least one system of river valley networks.
The ESA’s Mars Express orbiter has spotted a funny cloud on Mars, right near the Arsia Mons Volcano. At first glance it looks like a plume coming out of the volcano. But it’s formation is not related to any internal activity in this long-dead volcano. It’s a cloud of water ice known as an orographic or lee cloud.
The cloud isn’t linked to any volcanic activity, but its formation is associated with the form and altitude of Arsia Mons. Arsia Mons is a dormant volcano, with scientists putting its last eruptive activity at 10 mya. This isn’t the first time this type of cloud has been seen hovering around Arsia Mons.