It is rare when we highlight a celestial event (or events) that involves the zodiacal constellation of Cancer the Crab. In Greek mythology, Cancer was summoned to distract Hercules when he was battling the multiheaded Hydra the Serpent. The crab was crushed by Hercules’ foot, but to reward his effort Hera placed it among the … Read more
Scientists searching for the fossilized remains of ancient microbes on Mars now have a better idea of what signs they should be looking for, thanks to a new study of Earthly microbial fossils embedded in the mineral gypsum that was produced when the Mediterranean Ocean dried up over 5 million years ago. Mars was once … Read more
According to Darwin, life on Earth may have first appeared in warm little ponds. This simple idea is also a cornerstone in our search for the origin of life. The ponds were rich in important chemicals, and when lightning struck, somehow, it all got going. If the idea is correct, the same thing may have … Read more
Data from the Chinese rover Zhurong is adding to the pile of evidence for oceans on ancient Mars. For a year, this little craft traveled over nearly two kilometers of the Martian surface and made radar scans of buried natural structures that look like ocean shorelines. Zhurong’s ground-penetrating radar (GPR) looked under the surface to … Read more
Every Martian year (which last 686.98 Earth days), the Red Planet experiences regional dust storms that coincide with summer in the southern hemisphere. Every three Martian years (five and a half Earth years), these storms grow so large that they encompass the entire planet and are visible from Earth. These storms are a serious hazard … Read more
We’re now just past the midpoint of astronomical winter — that moment marking the midway point between December’s winter solstice and March’s vernal equinox. That moment took place at 4:11 p.m. Eastern Time on Feb. 3. And as darkness falls this week, we have what many refer to as the “Winter Triangle” dominating the southeast … Read more
New research suggests an impact recently rattled Mars deeper than thought. HiRISE images a recent impact crater in the Cerberus Fossae region, seen on March 4, 2021. Credit: NASA/MRO/HiRISE Something really rang the Red Planet’s bell. Research involving two NASA missions—the Mars Reconnaissance Orbiter, and the late InSight lander—has shed light on meteorite impacts and … Read more
A rock from space slammed into Mars in February 2021, causing seismic waves that reached NASA’s InSight spacecraft, located 1,000 miles (1,600 km) away. The impact left a 70-foot (21-meter) diameter crater and dented an area nearly a mile wide (1,600 meters). ESA’s ExoMars Trace Gas Orbiter (TGO), using its Color and Stereo Surface Imaging … Read more
View larger. | An example of weird, dark streaks called recurring slope lineae on the slopes of Mars’ Horowitz crater. Do liquid water brines form these streaks? A new study suggested brines on Mars are less likely to occur than scientists thought. Image via NASA/ JPL-Caltech/ University of Arizona. 2025 EarthSky lunar calendar is available … Read more
When will we be able to see the planets at their best during this upcoming year of 2025? This guide will tell you. It will also provide information as to when a particular solar system planet might be passing near to another, or a bright star, as well as the constellation that each will occupy … Read more