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[8] [9] [10] As of 2025, the Blackbird still holds all three world records. In 1989, the USAF retired the SR-71, largely for political reasons, [11] although several were briefly reactivated before their second retirement in 1998. NASA was the final operator of the Blackbird, using it as a research platform, until it was retired again in 1999. [12]
In December 2014, NASA awarded Lockheed Martin a contract to study the feasibility of building the SR-72's propulsion system using existing turbine engine technologies, The $892,292 (~$1.13 million in 2023) contract funded a design study to determine the viability of a TBCC propulsion system by combining one of several current turbine engines, with a very low Mach ignition Dual Mode Ramjet (DMRJ).
Roblox (/ ˈ r oʊ b l ɒ k s / ⓘ, ROH-bloks) is an online game platform and game creation system developed by Roblox Corporation that allows users to program and play games created by themselves or other users. It was created by David Baszucki and Erik Cassel in 2004, and released to the public in 2006. As of August 2020, the platform has ...
Pixabay.com is a free stock photography and royalty-free stock media website. It is used for sharing photos, illustrations, vector graphics , film footage , stock music and sound effects , exclusively under the custom Pixabay Content License, which generally allows the free use of the material with some restrictions.
This category is intended to hold images that are in the public domain in the United States. Each image in this category should have sufficient and verifiable source information in order to determine whether it is eligible for moving to Commons: Country of origin; Date when image was published; If country of origin is not the USA:
Download as PDF; Printable version; In other projects Appearance. ... meta:Free image resources This page is a soft redirect This page was last edited on 29 ...
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