Liquid water is not stable on the surface of Mars. But this new evidence indicates the planet once had a warmer, wetter climate.
The liquid water that did remain on the Martian surface carved out the riverbeds and other formations that we see there today, Wang says. But that water, too, would likely have disappeared had it not been trapped as ice at the Martian poles as the climate on the planet became colder, he...
—Astronomers spy new class of dark, water-rich asteroids like dwarf planet Ceres — Could the dwarf planet Ceres support life? Long ago, after Ceres had formed and was still warm, this icy crust could have been liquid, forming a shallow ocean beneath a thin layer of ice. Resear...
通读全文,并结合第一段“Researchers say they have discovered new evidence that Mars once had a large northern ocean. The finding adds to existing evidence that ancient Mars had the right conditions to possibly support some form of life.(研究人员表示,他们发现了新的证据,证明火星曾经有一个巨大的...
Curiosity had previously ascertained that the 154-km-wide (96 miles) Gale crater, which the rover is exploring, was filled with liquid water. The discovery that the bench-and-nose landforms were produced by rivers now gives some indication of the structure of that water-mass inside Gale crater...
About 4 billion years ago, when the sun wasn't as big and bright,Earth was a snowballcovered in ice. Yet early Earth appears to have had liquid water that supported life. Scientists like Ojha think the solution to this mystery for our planet and ancient Mars is that other sources of he...
(PhysOrg.com) -- NASA's Mars Reconnaissance Orbiter has discovered the total amount of atmosphere on Mars changes dramatically as the tilt of the planet's axis varies. This process can affect the stability of liquid water, if it exists on the Martian surface, and increase the frequency and...
contend that Ceres’ interior contains liquid water, similar to what has been found on Jupiter’s moon Europa and Saturn’s moon Enceladus. But in Ceres’ case, this liquid could be what is left over from its ancient ocean rather than the result of present-day geological activity in the ...
“good cup of Joe”. As we walked into the Diner the reality of being there was surreal. Here I was, not on a set, but in the actual diner they used in the pilot episode and suddenly I got the shivers – I had crossed over to the other side. We picked out a booth about half...
Way galaxy. A new analysis concludes that roughly half of the galaxy's sunlike stars host rocky worlds in habitable zones where liquid water could pool or flow over the planets' surfaces. Astronomers estimated the number of these planets using data from NASA's planet-hunting Kepler spacecraft...