Water moves. On Earth, it moves in the form of rivers, rain, or ocean swells. In space, its movements are more subtle but no less more important, and so far we understand very little about that process. Luckily, we had a tool to help us try to understand it better – the Hershel Space Observatory. Though it has been out of commission for over 8 years, a team of scientists have now compiled all a review of all of the papers using Hershel data to track water from its birth in interstellar clouds to its eventual resting place on planets. There are still some gaps, but it’s a worthy step towards a better understanding.Continue reading “How Does Water go From Interstellar Clouds to Habitable Worlds?”
We are extremely interested in the possibility of water on Mars, because where there’s water, there’s the potential for life. But a new study throws a bit of a wet blanket (pun intended) on that tantalizing possibility. Unfortunately, it looks like even the saltiest of brines can only exist on the Martian surface for up to a few hours at a time.Continue reading “Brines Could be Present on the Surface of Mars for up to 12 Hours, Never for a Full day”
Here on Earth, geologists seek out deep channels into Earth’s rock, carved over the ages by flowing water. The exposed rock walls are like a visual timeline of a region’s geological history. On Mars, the surface water is long gone. But it flowed long enough to expose layers of rock just like here on Earth.
One of those water-exposed areas on Mars is Mawrth Vallis, an outflow channel that feeds into the Chryse Basin.Continue reading “This is Mawrth Vallis on Mars, and it’s Positively Bursting with Evidence of Past Water Action on Mars”
Welcome back to our Fermi Paradox series, where we take a look at possible resolutions to Enrico Fermi’s famous question, “Where Is Everybody?” Today, we examine the possibility that the reason for the Great Silence is that many planets out there are just too watery!
In 1950, Italian-American physicist Enrico Fermi sat down to lunch with some of his colleagues at the Los Alamos National Laboratory, where he had worked five years prior as part of the Manhattan Project. According to various accounts, the conversation turned to aliens and the recent spate of UFOs. Into this, Fermi issued a statement that would go down in the annals of history: “Where is everybody?“
This became the basis of the Fermi Paradox, which refers to the disparity between high probability estimates for the existence of extraterrestrial intelligence (ETI) and the apparent lack of evidence. Since Fermi’s time, there have been several proposed resolutions to his question, which includes the possibility that many exoplanets are Waterworlds, where water is so plentiful that life will be less likely to emerge and thrive.Continue reading “Beyond “Fermi’s Paradox” XII: What is the Waterworlds Hypothesis?”
Mars is an arid place, and aside from a tiny amount of water vapour in the atmosphere, all water exists as ice. But it wasn’t always this arid. Evidence of the planet’s past wet chapter dots the surface. Paleolakes like Jezero Crater, soon to be explored by NASA’s Perseverance Rover, provide stark evidence of Mars’ ancient past. But what happened to all that water?
It disappeared into space, of course. But when? And how quickly?Continue reading “Mars Might Have Lost its Water Quickly”
I don’t know if you’ve noticed by now, but the Earth is a little bit wet. How Earth got all its water is one of the major mysteries in the formation of the solar system, and a team of Japanese researchers have just uncovered a major clue. But not on Earth – the clue is on Mercury.Continue reading “How did the Earth get its water? The answer might be found on Mercury”
The origin of Earth’s water is a big piece of the puzzle in Earth’s history. Did it come from comets and asteroids? From water-bearing space dust? The scientific debate is not settled.
Now a new study shows that water could have been delivered to Earth by organic matter.Continue reading “Organic Matter Could Have Delivered Earth’s Water”
A new study shows that the Moon is more metal-rich than previously thought. That has some far-reaching implications for our understanding of the Moon’s formation. If their results are solid, it means that we may need to re-think the giant impact hypothesis for the formation of the Moon.Continue reading “The Moon Might Be More Metal-Rich Than We Thought”
We all know what water is. And what rock is. The difference is crystal clear. Well, here on Earth it is.
But on other worlds? The difference might not be so clear.Continue reading “Deep Down in Ocean Worlds, it’s Difficult to Tell Where the Oceans End and the Rock Begins”
So you want to colonize Mars, huh? Well Mars is a long ways away, and in order for a colony to function that far from Earthly support, things have to be thought out very carefully. Including how many people are needed to make it work.
A new study pegs the minimum number of settlers at 110.Continue reading “The Bare Minimum Number of Martian Settlers? 110”