Explore the fundamental laws of nature, major scientific theories, breakthroughs, and the impact of science on society.
The reason cilantro tastes like soap to some people comes down to your DNA. Specifically, a gene variation called OR6A2 makes certain people highly sensitive to aldehydes, which are natural compounds found in both cilantro and soap. This sensitivity varies by population, with about 13% of people wit...
ViewWhy does one song hijack your brain? Earworms love familiar, repetitive tunes and usually pop up when your mind is relaxed or wandering. Quick fix: chew gum or switch to another song to break the loop....
ViewGeothermal plants work best near tectonic plate boundaries or volcanic areas where heat is close to surface. Binary cycle plants can generate electricity from fluid temperatures as low as 57 degrees Celsius. Dry steam, flash steam, and binary cycle are the three main types of geothermal power plants...
ViewWhy the 1997 Mars Reference Mission mattered: it cut SEI-era brute force with aerobraking, ISRU for ascent propellant, 600-day surface stays, and no heavy on-orbit assembly, making Mars look less like a giant one-off and more like a repeatable mission path....
ViewViking 1 landed in eastern Chryse Planitia on 20 July 1976, and Viking 2 on 3 September 1976. The first color images from the Viking 1 lander showed cinnamon-red dirt, gray rocks, and a blue sky. When the images were corrected, Mars' sky turned dusky pink with wind-borne dust. The instruments return...
ViewBefore 1965, many Mars planners still pictured a world with canals, maybe even life, and spacecraft designs aimed at warm equatorial landing sites. Then Mariner 4 flew past Mars on July 15, 1965 and sent back the first close pictures of another planet. The images showed a cratered, Moon-like surface...
ViewVon Braun Mars plan 10 ships, 70 crew, inflatable spheres 🚀 Von Braun’s Mars plan ended with a polar glider landing and a 4,000-mile trek to base....
ViewA conjunction-class Mars mission uses low-energy transfers to Mars and back, with a long stay at Mars of roughly 500 days, for a total mission duration of about 1,000 days. An opposition-class mission uses one low-energy transfer and one high-energy transfer, with a short stay at Mars of typically l...
ViewIn the source, a conjunction-class Mars mission is one that uses low-energy transfers to Mars and back, with a long stay at Mars of roughly 500 days, so the total mission lasts about 1,000 days. An opposition-class mission uses one low-energy transfer and one high-energy transfer, with a short stay ...
ViewIn 2024-2025, the biggest recurring topics around NASA’s Mars planning were the Moon-to-Mars strategy, in-situ resource utilization, radiation risk, and whether Artemis hardware and operations are building the right experience for Mars. NASA describes Artemis as a step toward “the first crewed missi...
ViewApollo 11’s first lunar EVA lasted 2:32. Neil Armstrong and Edwin Aldrin spent 2:32 on the first Moonwalk. Apollo 12’s second EVA became the first long, 1800-m lunar traverse. Apollo 15’s three traverses collected nearly 80 kg of samples. Apollo 17’s second EVA was the longest of the Apollo program,...
ViewWalking to Olympus traces the history of extravehicular activity, better known as spacewalking, from the first Soviet and American spacewalks in 1965 to the complex repairs and construction work of the 1990s. It shows how astronauts and cosmonauts learned, step by step, how to work safely and effect...
ViewLevel 1 (sequence): Challenge: Drag these first-steps spacewalks into the right order: Leonov, White, Aldrin. Hint: Start with the Soviet first, then the first U.S. EVA, then the first successful complex EVA on Gemini 12. Answer: Leonov, White, Aldrin Context: Boom. You just marched from the first E...
ViewHis visor fogged, sweat poured, and Cernan was barely hanging on 😮💨 Gemini 9's spacewalk got rough fast The plan was huge: retrieve a package, then fly the AMU backpack out to 45 meters 🚀 But the tether, suit, and workload fought back Cernan said he was spending half his effort just staying in p...
ViewEVA risk timeline Ed White called it “the saddest moment of my life” when he had to return to Gemini 4. Reentry is where EVA risk flips: the umbilical limits distance, but procedure decides the return....
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