![Mysterious, ultra low-frequency noises detected in Earth's atmosphere — and scientists can't explain them | Live Science Mysterious, ultra low-frequency noises detected in Earth's atmosphere — and scientists can't explain them | Live Science](https://cdn.mos.cms.futurecdn.net/zDsJLyLQ5MHVfdew29Z23G.jpg)
Mysterious, ultra low-frequency noises detected in Earth's atmosphere — and scientists can't explain them | Live Science
![U2 Dragon Lady Blueprint Vers #2, CIA U2 Spy Plane Drawing, Lockheed U2 Dragon Lady Poster, Air Force Pilot Gift Idea, Air Force Decor U2 Dragon Lady Blueprint Vers #2, CIA U2 Spy Plane Drawing, Lockheed U2 Dragon Lady Poster, Air Force Pilot Gift Idea, Air Force Decor](https://i.etsystatic.com/10464274/r/il/7cc85a/2366775741/il_fullxfull.2366775741_85ri.jpg)
U2 Dragon Lady Blueprint Vers #2, CIA U2 Spy Plane Drawing, Lockheed U2 Dragon Lady Poster, Air Force Pilot Gift Idea, Air Force Decor
![UK ultra-lightweight UAV Zephyr X can fly at 70,000 feet for up to 45 days at a time | NextBigFuture.com UK ultra-lightweight UAV Zephyr X can fly at 70,000 feet for up to 45 days at a time | NextBigFuture.com](https://nextbigfuture.s3.amazonaws.com/uploads/2016/08/s300_Zephyrgov-1.jpg)
UK ultra-lightweight UAV Zephyr X can fly at 70,000 feet for up to 45 days at a time | NextBigFuture.com
![Realtime Global Data Intelligence Platform on Twitter: "🇺🇸 ✈ #USAF United States Air Force, Lockheed U-2S (80-1092, AE0966), previously flown by the Central Intelligence Agency (CIA). It provides day and night, high-altitude ( Realtime Global Data Intelligence Platform on Twitter: "🇺🇸 ✈ #USAF United States Air Force, Lockheed U-2S (80-1092, AE0966), previously flown by the Central Intelligence Agency (CIA). It provides day and night, high-altitude (](https://pbs.twimg.com/media/EoNiyUYWEAABtEE.jpg:large)
Realtime Global Data Intelligence Platform on Twitter: "🇺🇸 ✈ #USAF United States Air Force, Lockheed U-2S (80-1092, AE0966), previously flown by the Central Intelligence Agency (CIA). It provides day and night, high-altitude (
![The Lockheed U-2, nicknamed 'Dragon Lady', is a single-engine, very high-altitude reconnaissance aircraft operated by the United States Air Force (USAF) and previously flown by the Central Intelligence Agency (CIA). It provides The Lockheed U-2, nicknamed 'Dragon Lady', is a single-engine, very high-altitude reconnaissance aircraft operated by the United States Air Force (USAF) and previously flown by the Central Intelligence Agency (CIA). It provides](https://c8.alamy.com/comp/2B01R0F/the-lockheed-u-2-nicknamed-dragon-lady-is-a-single-engine-very-high-altitude-reconnaissance-aircraft-operated-by-the-united-states-air-force-usaf-and-previously-flown-by-the-central-intelligence-agency-cia-it-provides-day-and-night-very-high-altitude-70000-feet-21000-meters-all-weather-intelligence-gathering-the-aircraft-is-also-used-for-electronic-sensor-research-and-development-satellite-calibration-and-satellite-data-validation-2B01R0F.jpg)