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50,000 year-old 1200-meter squarish Meteor Crater in Arizona USA, created by the ~10 megaton blast of a ~300,000 ton meteor colliding at high speed
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This is why sailors always carry a hatchet
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The “flint” is ferrocerium, a pyrophoric alloy that spontaneously catches fire when fragmented in air.
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Novel Treatment Causes Cancer to Self-Destruct Without Affecting Healthy Cells
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NASA’s colorized visualization of supersonic shock waves
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Lightning! Notice the slow forking “leaders” before the main strike. Most lightning is intra- or inter-cloud; some is ground-to-cloud.
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The Vostok “Sharik” descent capsule—a simple but effective cannonball design—that returned Yuri Gargarin and others from the earliest orbital spaceflights. The cosmonaut was ejected at 7,000 meters to parachute to earth; thus some have criticized the Soviet claim to first man—and woman, on the final flight, Vostok 6—in space.
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NASA’s Parker Solar Probe will achieve a heliocentric velocity of 200 km/s (nearly 500,000 mph) and skim just 6.0 million km (3.7 million miles) above the Sun’s surface, far closer than Mercury. It will endure 1400° C behind an innovative carbon-fiber heat shield. In the mission’s two dozen passes through 2025, flybys of Venus will decelerate it to bring its perihelion closer to the Sun. Scheduled for launch July 31, 2018 on a Delta IV Heavy. More details.
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Microgravity! Read OK Go’s production details (video) and watch their other clever physics-oriented videos.
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Discuss. (source: https://lifestyle.clickhole.com/incredible-we-asked-these-astronauts-what-it-s-like-to-1825124428#1, )
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View at full screen, click and drag to look around. 8K 360 video of the Lunar Eclipse and Aurora Borealis near Fairbanks, AK
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