A quasar is an extremely bright and distant point-like source visible to radio telescopes. The source is a so-called Active Galactic Nucleus, fueled by a supermassive black hole. Source: https://earthsky.org/astronomy-essentials/definition-what-is-a-quasar…
Tag: friction
Mars rovers safe from lightning strikes, research finds
If experiments done in small bottles in a University of Oregon lab are accurate, the friction of colliding Martian dust particles are unlikely to generate big electrical storms or threaten the newly arrived exploration vehicles or, eventually, human visitors. Source: https://phys.org/news/2021-02-mars-rovers-safe-lightning.html…
How To Fall 35,000 Feet and Survive
Massachusetts-based amateur historian Jim Hamilton, who developed the Free Fall Research Page — an online database of nearly every imaginable human plummet, documents one case of a sky diver who, upon total parachute failure, was saved by bouncing off high-tension wires. Contrary to popular belief, water is an awful choice. Like concrete, liquid doesn’t compress. Hitting the ocean is essentially the…
Anniversary of mysterious parade of meteors
On February 9, 1913, lucky observers witnessed the Great Meteor Procession, when bright meteors soared horizontally across the sky in a stately marching rank for minutes at a time. Source: https://earthsky.org/space/this-date-in-science-great-meteor-procession-of-february-9-1913…
NASA “mole’s” attempts to dig into Mars failed. What’s next?
The mission team for NASA’s InSight lander called off its attempts to try to dig deeper into Mars with the heat probe known as “the mole.” Meanwhile, the rest of the mission gained an extension to December 2022. Source: https://earthsky.org/space/nasa-calls-halt-to-attempts-by-insight-mole-to-dig-into-mars…
After 2 Years on Mars, NASA’s Digger Declared Dead
“NASA declared the Mars digger dead Thursday after failing to burrow deep into the red planet to take its temperature,” reports the Associated Press: Scientists in Germany spent two years trying to get their heat probe, dubbed the mole, to drill into the Martian crust. But the 16-inch-long (40-centimeter) device that is part of NASA’s InSight lander couldn’t gain enough friction…
The Best Way To Win a Horse Race? Mathematicians May Have the Answer
sciencehabit summarizes a new article from Science magazine: Attention racehorse jockeys: Start fast, but save enough energy for a final kick. That’s the ideal strategy to win short-distance horse races, according to the first mathematical model to calculate how horses use up energy in races. The researchers say the approach could be used to identify customized pacing plans that, in theory,…
This asteroid just skimmed Earth’s atmosphere
The asteroid – 2020 VT4 – is estimated to be between 16 and 36 feet (5-11 meters). It skimmed the top of our atmosphere on Friday, November 13, 2020. Astronomers spotted it one day later. Source: https://earthsky.org/space/asteroid-2020-vt4-skimmed-atmosphere-fri-nov-13-2020…
How Jupiter’s moon Io gets its hellish atmosphere
Hot, active volcanoes produce almost half of Jupiter’s moon Io’s sulfur atmosphere, according to new observations using the ALMA telescope. The rest comes from cold sulfur deposits that freeze on the surface, then sublimate in sunlight. Source: https://earthsky.org/space/io-sulfur-volcanoes-hot-so2-cold-so2…
Wikimedia Is Moving To GitLab
The Wikimedia Foundation, the American non-profit organization that owns the internet domain names of many movement projects and hosts sites like Wikipedia, has decided to migrate their code repositories from Gerrit to Gitlab. Slashdot reader nfrankel shares the announcement: For the past two years, our developer satisfaction survey has shown that there is some level of dissatisfaction with Gerrit, our code…