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The Space Test Program (STP) is the primary provider of spaceflight for the United States Department of Defense (DoD) space science and technology community. STP is managed by a group within the Advanced Systems and Development Directorate , a directorate of the Space and Missile Systems Center of the United States Space Force .
[5] [11] The new propellant is an energetic ionic liquid. Ionic liquids are salt compounds in a liquid form whose molecules have either a positive or negative charge, which bonds them together more tightly and makes the liquid more stable. [12] This new propellant is also expected to be significantly less harmful to the environment. [6]
Also in 2016, Quizlet launched "Quizlet Live", a real-time online matching game where teams compete to answer all 12 questions correctly without an incorrect answer along the way. [15] In 2017, Quizlet created a premium offering called "Quizlet Go" (later renamed "Quizlet Plus"), with additional features available for paid subscribers.
This list of space telescopes (astronomical space observatories) is grouped by major frequency ranges: gamma ray, x-ray, ultraviolet, visible, infrared, microwave, and radio.
Kahoot! is a Norwegian online game-based learning platform. [3] It has learning games, also known as "kahoots", which are user-generated multiple-choice quizzes that can be accessed via a web browser or the Kahoot! app. [4] [5]
This test was followed by an orbital test, SERT-2, in 1970. Deep Space 1 (DS1), which NASA launched in 1998, demonstrated the long-duration use of a xenon -propelled ion thruster on a science mission, [ 23 ] and validated a number of technologies, including the NSTAR electrostatic ion thruster , as well as performing a flyby of an asteroid and ...
17 March 2002, 04:21 UTC [5] The Gravity Recovery and Climate Experiment ( GRACE ) was a joint mission of NASA and the German Aerospace Center (DLR). Twin satellites took detailed measurements of Earth's gravity field anomalies from its launch in March 2002 to the end of its science mission in October 2017.
Longjiang 2's crash site is located at inside Van Gent crater, where it made a 4 by 5 metre crater upon impact These microsatellites were tasked to observe the sky at very low frequencies (1–30 megahertz ), corresponding to wavelengths of 300 to 10 metres (984 to 33 ft), with the aim of studying energetic phenomena from celestial sources.