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Space Shuttle Columbia disasterDate February 1, 2003; 21 years ago () Time 8:59 am EST (13:59 UTC)Location Over Texas and LouisianaCause Damage to the left wing's edge by debris from the external tank during launchOutcome Loss of Columbia and seven astronauts; Space Shuttle fleet grounded for 29 months and subsequently retired after completion of the International Space Station.
- February 1, 2003; 20 years ago
- Damage to the left wing's edge by debris from the external tank during launch
Polytetrafluoroethylene is a fluorocarbon solid, as it is a high- molecular-weight polymer consisting wholly of carbon and fluorine. PTFE is hydrophobic: neither water nor water-containing substances wet PTFE, as fluorocarbons exhibit only small London dispersion forces due to the low electric polarizability of fluorine.
- (C₂F₄)ₙ
- 0.25 W/(m·K)
- 2200 kg/m³
- 327 °C
Taiwan,[II][k] officially the Republic of China (ROC),[I][l] is a country[27] in East Asia.[o] It is located at the junction of the East and South China Seas in the northwestern Pacific Ocean, with the People's Republic of China (PRC) to the northwest, Japan to the northeast, and the Philippines to the south. The territories controlled by the ...
The Antonov An-225 Mriya ( Ukrainian: Антонов Ан-225 Мрія, lit. 'dream' or 'inspiration'; NATO reporting name: Cossack) was a strategic airlift cargo aircraft designed and produced by the Antonov Design Bureau in the Soviet Union . It was originally developed during the 1980s as an enlarged derivative of the Antonov An-124 ...
- 21 December 1988
- 1985
ENIAC ( / ˈɛniæk /; Electronic Numerical Integrator and Computer) [1] [2] was the first programmable, electronic, general-purpose digital computer, completed in 1945. [3] [4] Other computers had some of these features, but ENIAC was the first to have them all.
The Chernobyl disaster [a] began on 26 April 1986 with the explosion of the No. 4 reactor of the Chernobyl Nuclear Power Plant, near the city of Pripyat in the north of the Ukrainian SSR, close to the border with the Byelorussian SSR, in the Soviet Union. [1] It is one of only two nuclear energy accidents rated at seven—the maximum severity ...
Transport Layer Security ( TLS) is a cryptographic protocol designed to provide communications security over a computer network. The protocol is widely used in applications such as email, instant messaging, and voice over IP, but its use in securing HTTPS remains the most publicly visible. The TLS protocol aims primarily to provide security ...
