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In the 1980s and '90s, a push to lower the legal blood alcohol content (BAC) limit for getting behind the wheel took the country by storm. Mothers Against Drunk Driving (MADD) was formed in 1980 ...
If approved, Senate Bill 5067 would make Washington the second state to lower its per se blood alcohol concentration, or BAC.) limit for driving, from .08% to .05%. Utah was the first, with its ...
Planetary boundaries are a framework to describe limits to the impacts of human activities on the Earth system. Beyond these limits, the environment may not be able to self-regulate anymore. This would mean the Earth system would leave the period of stability of the Holocene, in which human society developed.
The Multi-Unit Space Transport And Recovery Device or MUSTARD, usually written as Mustard, was a reusable launch system concept that was explored by the British Aircraft Corporation (BAC) during the mid-1960s. Mustard was intended to operate as a multistage rocket, the individual stages comprising near-identical spaceplane modules.
The Roche limit for a rigid spherical satellite is the distance, , from the primary at which the gravitational force on a test mass at the surface of the object is exactly equal to the tidal force pulling the mass away from the object: [3] [4]
Rømer compared the apparent duration of Io's orbits as Earth moved towards Jupiter (F to G) and as Earth moved away from Jupiter (L to K). 1632 – Galileo Galilei writes about the relativity of motion and that some forms of motion are undetectable; this would be later called the relativity principle , essential for special relativity as one ...
Vanguard 2. Measured cloud cover. First attempted photo of Earth from a satellite; precession motion resulted in difficulty interpreting data (see first images of Earth from space). [2] 10.8 kg (23.7 lb) March 3 US: Pioneer 4: Juno II: Success: Passed within 60,030 km (37,300 mi) of the Moon into a heliocentric orbit, returning excellent ...
[19]: 341 In particular, it is still not clear how these objects grow to become 0.1–1 km (0.06–0.6 mi) sized planetesimals; [5] [20] this problem is known as the "meter size barrier": [21] [22] As dust particles grow by coagulation, they acquire increasingly large relative velocities with respect to other particles in their vicinity, as ...