New research shows that Mars has faced a constant rain of meteors during the last 600 million years. This finding contradicts previous research showing that the impact rate has varied, with prominent activity spikes. Why would anyone care how often meteors rained down on Mars, a planet that’s been dead for billions of years?
Because whatever Mars was subjected to, Earth was also likely subjected to.
Who wouldn’t want to know our planet’s history?
Continue reading “It’s Been Constantly Raining Meteors on Mars for 600 Million Years. Earth too.”
Scientists’ detailed study of the Moon dates back to the Apollo missions when astronauts brought rock samples from the lunar surface back to Earth for analysis. Apollo 11 gathered samples from the lunar highland regions, the pale areas on the Moon’s surface easily seen from Earth. The highlands are made of a relatively light rock called anorthosite, which formed early in the history of the Moon, between 4.3 and 4.5 billion years ago.
There’s some mystery involved in the anorthosite formation on the Moon. The age of the anorthosite highlands doesn’t match how long it took for the Moon’s magma ocean to cool. But scientists behind a new study think they’ve solved that mystery.
Continue reading “The Moon’s Crust was Formed From a Frozen Slushy Magma”
The Alan Hills meteorite is a part of history to Mars aficionados. It came from Mars and meteorite hunters discovered in Antarctica in 1984. Scientists think it’s one of the oldest chunks of rock to come from Mars and make it to Earth.
The meteorite made headlines in 1996 when a team of researchers said they found evidence of life in it.
Continue reading “Remember When Life was Found in a Martian Meteorite? Turns out, it was Just Geology”
The InSight lander has been on Mars, gathering data for a thousand days now, working to give us a better understanding of the planet’s interior. It’s at Elysium Planitia, the second largest volcanic region on Mars. A newly-published paper based on seismic data from the lander shows something unexpected underground: a layer of sediment sandwiched between layers of lava flows.
Continue reading “InSight Peers Deep Below the Surface on Mars”
Photos can’t do some places justice – nor can any level of sophisticated remote sensing. That seems to be the case for Gale Crater. Curiosity has been wandering around the crater for almost the last nine years. Scientists thought Gale crater was an old lakebed, and it was specifically chosen as a landing site to allow Curiosity to collect samples from such a lakebed. But new research from scientists at the University of Hong Kong shows that most likely, the samples Curiosity has been analyzing during its sojourn didn’t actually form in a lake.
Continue reading “Curiosity Might Not Be In An Ancient Lake At All”
Geologists love fieldwork. They love getting their specialized hammers and chisels into seams in the rock, exposing unweathered surfaces and teasing out the rock’s secrets. Mars would be the ultimate field trip for many of them, but sadly, that’s not possible.
Instead, we’ve sent the Perseverance rover on the field trip. But if a geologist were along for the ride, what would it look like to them?
Continue reading “What a Geologist Sees When They Look at Perseverance’s Landing Site”
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”
Northern Canada has been keeping a secret from the rest of the world. It’s home to “Resurrection,” a tectonic plate that has been much theorized but never found until now. A team of researchers used what amounts to a CAT scan of northern Canada and the mantle underneath it to find the missing plate.
Finding it could lead to better hazard prediction and also to finding mineral and hydrocarbon deposits. But better than that, it’s helping scientists piece together Earth’s history.
Continue reading “Geologists Have Found the Earth’s Missing Tectonic Plate”
Scientists are getting better at understanding exoplanets. We now know that they’re plentiful, and that they can even orbit dead white dwarf stars. Researchers are also getting better at understanding how they form, and what they’re made of.
A new study says that some carbon-rich exoplanets could be made of silica, and even diamonds, under the right circumstances.
Continue reading “There Could Be Carbon-Rich Exoplanets Made Of Diamonds”
It takes oxygen to make iron rust. So when scientists discovered hematite spread widely through lunar high latitudes, they were surprised. How did that happen?
A new study suggests that oxygen from Earth could be playing a role in rusting the Moon.
Continue reading “Earth’s Oxygen Could be Making the Moon Rust”