Parker Solar Probe, launched August 12, 2018 on a Delta IV Heavy, became NASA’s first mission to fly through the Sun’s corona and “touch the Sun” in April 2021 when it crossed the Alfvén critical boundary during its 8th orbit. At its closest approaches Parker reaches about 3.8–4 million miles (6.2 million km) from the…
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SOHO (Solar and Heliospheric Observatory), launched in 1995, became the first satellite to continuously observe the Sun from the Sun–Earth L1 point and carries the LASCO coronagraph, enabling CME tracking and the discovery of more than 5,000 comets. ACE (Advanced Composition Explorer), launched in 1997, and NOAA’s DSCOVR (Deep Space Climate Observatory), launched in 2015,…
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As of 2024, about 53.4% of Ivorians live in urban areas, while urban internet usage is roughly 50% compared with 22% in rural areas. Côte d’Ivoire has laid over 5,200 km of fiber under the RNHD backbone, targeting nearly 7,000 km by September 2025. The country is connected to the ACE and WACS submarine cables,…
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The Nancy Grace Roman Space Telescope is planned to launch in late 2026 (latest commitment by May 2027) aboard SpaceX’s Falcon Heavy to a halo orbit around the Sun-Earth L2, about 1.5 million kilometers from Earth. Roman uses a 2.4-meter primary mirror repurposed from Hubble and a 300-megapixel Wide Field Instrument that covers about 0.28…
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NASA’s Hyperion, launched in 2000 on the EO-1 satellite, collected 220 spectral bands from 400 to 2500 nm at 30 m resolution. A hyperspectral data cube stacks hundreds of narrow wavelength bands for every ground pixel, creating a two-dimensional spatial image plus a spectral dimension. Hyperspectral imaging records hundreds of narrow bands (often 10 nm…
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As of mid-2025, Starlink is available in over 110 countries and territories. In the United States, Starlink began with limited trials in August 2020 and the public beta “Better Than Nothing Beta” in November 2020, and now has nationwide commercial coverage including Puerto Rico and the U.S. Virgin Islands, with over 2.5 million subscribers as…
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About 75% of the planet is obscured by cloud cover or darkness at any moment, making optical imaging inaccessible. Synthetic Aperture Radar (SAR) satellites actively illuminate the ground with microwave radar and synthesize a large aperture by moving the antenna to produce high-resolution images. SAR can operate day or night and in all weather, providing…
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The United States operates the Advanced Extremely High Frequency (AEHF) constellation, delivering jam-resistant, global, protected military communications including nuclear command and control links. Navstar GPS is a 31-satellite global navigation system that provides precise positioning, navigation, and timing to guide munitions such as JDAM and to synchronize encrypted networks. Defense Support Program (DSP) and the…
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As of early 2025, about 12.4 million Cameroonians were internet users, representing 41.9% of the population. As of 2024, roughly 60% of Cameroonians live in urban areas, with internet access heavily concentrated in cities and rural areas almost inaccessible. Cameroon’s fiber backbone extends over 12,000 kilometers and is connected to five landfall cables: SAT-3, WACS,…
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Satellite internet data travels from your dish to a satellite, then to a gateway and onto the internet, with traditional GEO orbits at about 35,786 km and newer systems like SpaceX Starlink using low Earth orbit swarms and inter-satellite laser links. Geostationary (GEO) latency is roughly 500–700 ms for a round trip, while Starlink’s low…
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