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”
One of the most enduring questions about Earth regards the origins of its water. Where did it come from? One widely-held theory gives comets the honor of bringing water to Earth. Another one says that Earth’s water came when a protoplanet crashed into early Earth, not only delivering a vast quantity of water, but creating the Moon.
Now a new study shows that the minor planet Vesta got its water from space dust. Could that help explain the origin of Earth’s water?
Continue reading “Space Dust Delivered Water to Vesta, Could it Have Done the Same for Earth?”
Evidence from an ancient section of the Earth’s crust suggest that Earth was once a water-world, some three billion years ago. If true, it’ll mean scientists need to reconsider some thinking around exoplanets and habitability. They’ll also need to reconsider their understanding of how life began on our planet.
Continue reading “3 Billion Years Ago, the World Might Have Been a Waterworld, With No Continents At All”
What’s been long-suspected has now been confirmed: Jupiter’s moon Europa has water. As we’ve learned more about the outer Solar System in recent years, Europa has become a high-priority target in the search for life. With this discovery, NASA has just painted a big red bulls-eye on Jupiter’s smallest Galilean moon.
Continue reading “Water Vapor Was Just Found on Europa, More Evidence There’s Liquid Water Beneath All that Ice”
Astronomers using the Hubble space telescope have discovered water in the atmosphere of an exoplanet in its star’s habitable zone. If confirmed, it will be the first time we’ve detected water—a critical ingredient for life as we know it—on an exoplanet. The water was detected as vapour in the atmosphere, but the temperature of the planet means it could sustain liquid water on its surface, if it’s rocky.
Continue reading “Water Discovered in the Atmosphere of an Exoplanet in the Habitable zone. It Might Be Rain”
Right now, the Japanese Aerospace Exploration Agency‘s (JAXA)
Hayabusa2 spacecraft is busy exploring the asteroid 162173 Ryugu. Like it’s predecessor, this consists of a sample-return mission, where regolith from the asteroid’s surface will be brought back home for analysis. In addition to telling us more about the early Solar System, these studies are expected to shed light on the origin of Earth’s water (and maybe even life).
Meanwhile, scientists here at home have been busy examining the samples returned from 25143 Itokawa by the Hayabusa1 spacecraft. Thanks to a recent study by a pair of cosmochemists from Arizona State University (ASU), it is now known that this asteroid contained abundant amounts of water. From this, the team estimates that up to half the water on Earth could have come from asteroid and comet impacts billions of years ago.
Continue reading “Hayabusa1’s Samples of Itokawa Turned up Water That’s Very Similar to Earth’s Oceans”
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.
Continue reading “Signs that Ancient Rivers Flowed Across the Surface of Mars, Billions of Years Ago”