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Countdown. A countdown is a sequence of backward counting to indicate the time remaining before an event is scheduled to occur. NASA commonly employs the terms "L-minus" and "T-minus" during the preparation for and anticipation of a rocket launch, [1] and even "E-minus" for events that involve spacecraft that are already in space, where the "T ...
A launch status check, also known as a "go/no go poll" and several other terms, occurs at the beginning of an American spaceflight mission in which flight controllers monitoring various systems are queried for operation and readiness status before a launch can proceed. For Space Shuttle missions, in the firing room at the Launch Control Center ...
Additionally, one rocket and its payload were destroyed before launch in preparation for an on-pad static fire test. The active version of the rocket, the Falcon 9 Block 5, has flown 323 times successfully. In 2022, the Falcon 9 set a new record with 60 successful launches by the same launch vehicle type in a calendar year.
Launch window. The launch window is defined by the first launch point and ending launch point. It may be continuous (i.e. able to launch every second in the launch window) or may be a collection of discrete instantaneous points between the open and close. [14] Launch windows and days are usually calculated in UTC and then converted to the local ...
An online clock timer, [24] developed by Aaron Friedman and Yehonatan Tsirolnik, that automatically resets when Palestinian rocket attacks on Israel occur uses information from the IDF Home Front Command system and counts time up from the last Palestinian rocket attack on Israel. It displays how long Israel has been rocket-free and shows the ...
405 km (251 mi) Maximum speed. 75 km/h (47 mph) The BM-21 "Grad" (Russian: БМ-21 "Град", lit. ' hailstorm ') is a self-propelled 122 mm multiple rocket launcher designed in the Soviet Union. [10] The system and the M-21OF rocket [11] were first developed in the early 1960s, and saw their first combat use in March 1969 during the Sino ...
A multiple rocket launcher (MRL) or multiple launch rocket system (MLRS) is a type of rocket artillery system that contains multiple launchers which are fixed to a single platform, and shoots its rocket ordnance in a fashion similar to a volley gun. Rockets are self-propelled in flight and have different capabilities than conventional artillery ...
High-power rocketry is a hobby similar to model rocketry. The major difference is that higher impulse range motors are used. The National Fire Protection Association (NFPA) definition of a high-power rocket is one that has a total weight of more than 1,500 grams (3.3 lb) and contains a motor or motors containing more than 125 grams (4.4 oz) of ...